The reigning champions took just 25 minutes to pocket the bonus point at Energia Park, their elusive full-back Ella Roberts touching down on her first start.
Elise O’Byrne-White, Lisa Callan, Nikki Caughey and Niamh Byrne also registered tries, their clinical play leading to a 27-0 half-time lead.
Ulster rallied during the third quarter with well-taken scores from forwards Ilse van Staden and Taryn Schutzler, but Phil de Barra’s Blues had too much quality and depth.
Their 11-try haul was completed by Michelle Claffey’s brace, Roberts’ second of the evening, and Grace Miller and lively replacements Emily McKeown and Vic O’Mahony added their names to the scoresheet too.
Leinster stated their intent with a quick-fire third-minute score, the returning O’Byrne-White crossing in the left corner after incisive running from Roberts, Miller and Jenny Murphy.
Busy scrum half Molly Scuffil-McCabe knitted it all together nicely, but Ulster responded well with Jemma Farrell kicking cleverly and captain Beth Cregan and second row Schutzler imposing themselves up front.
However, the hosts went 12-0 up when pacy hooker Callan cut past two defenders, outside the Ulster 22, and fended off full-back Dolores Hughes for a fantastic finish under the posts. Murphy converted.
With athletic flanker Emma Murphy in player-of-the-match form, Leinster whipped up the pace again early in the second quarter.
Skipper Christy Haney and Jennie Finlay punched holes in the Ulster defence before Scuffil-McCabe neatly fed Caughey for a five-pointer out left.
Lovely hands from Mairead Holohan then sent Murphy charging past halfway, the move breaking down but Scuffil-McCabe’s kick through was seized upon by Roberts who brilliantly beat Peita McAlister’s challenge to hare home.
Replacement Lauren Farrell-McCabe kept the pace high following a quickly-taken penalty on the half hour, the blue wave leading to centre Byrne going over on the right via a big hand-off on Fern Wilson.
One of Ulster’s best moments came just before the break, out-half Toni Macartney slashing through past halfway, yet that good work was undone when Farrell missed touch from a penalty.
They fell further behind three minutes into the second half, Finlay using a dummy to pierce the defensive line before Claffey, last week’s player-of-the-match in Galway, stepped off her right and reached out to score.
A bout of direct carrying finally got Ulster firing in the opposition, as replacement prop van Staden bounced off a tackle to score to the left of the posts. Farrell added the extras.
Ulster swiftly handed back those five points, though, as Farrell-McCabe ran back a kick in superb fashion, managing to pass out of a tackle for Claffey to claim an opportunist 48th-minute try.
Nonetheless, Neill Alcorn’s charges were now making more inroads – particularly through their pack – and Schutzler broke down the blindside of a lineout maul for an snappily-taken effort, making it 37-12.
Ulster’s industrious number 8 Stacey Sloan battled hard at the breakdown to win a relieving penalty. However, there was another Leinster try around the corner – and a final flourish in front of an appreciative home crowd.
The speedy Roberts profited from some good passing to score despite Macartney’s cover tackle, and then replacement Rachel Horan broke off the base of a scrum and fed winger Miller for a deserved 66th-minute score.
There was still time for Naas flyer McKeown to make her mark on her debut, bursting past Jill Stephens to score in the left corner from 25 metres out.
McKeown’s pace cut open the Ulster defence again in the last minute, paving the way for O’Mahony to rumble over. The only blot on Leinster’s copybook was the lack of success from the tee.
TIME LINE: 3 minutes – Leinster try: Elise O’Byrne-White – 5-0; conversion: missed by Jenny Murphy – 5-0; 18 mins – Leinster try: Lisa Callan – 10-0; conversion: Jenny Murphy – 12-0; 22 mins – Leinster try: Nikki Caughey – 17-0; conversion: missed by Jenny Murphy – 17-0; 25 mins – Leinster try: Ella Roberts – 22-0; conversion: missed by Jenny Murphy – 22-0; 31 mins – Leinster try: Niamh Byrne – 27-0; conversion: missed by Jenny Murphy – 27-0; Half-time – Leinster 27 Ulster 0; 43 mins – Leinster try: Michelle Claffey – 32-0; conversion: missed by Nikki Caughey – 32-0; 45 mins – Ulster try: Ilse van Staden – 32-5; conversion: Jemma Farrell – 32-7; 48 mins – Leinster try: Michelle Claffey – 37-7; conversion: missed by Nikki Caughey – 37-7; 52 mins – Ulster try: Taryn Schutzler – 37-12; conversion: missed by Jemma Farrell – 37-12; 60 mins – Leinster try: Ella Roberts – 42-12; conversion: missed by Nikki Caughey – 42-12; 66 mins – Leinster try: Grace Miller – 47-12; conversion: missed by Aine Donnelly – 47-12; 77 mins – Leinster try: Emily McKeown – 52-12; conversion: missed by Aine Donnelly – 52-12; 80 mins – Leinster try: Vic O’Mahony – 57-12; conversion: missed by Aine Donnelly – 57-12; Full-time – Leinster 57 Ulster 12
LEINSTER WOMEN: Ella Roberts (Wicklow RFC); Grace Miller (Old Belvedere RFC), Michelle Claffey (Blackrock College RFC), Niamh Byrne (Railway Union RFC), Elise O’Byrne-White (Old Belvedere RFC); Nikki Caughey (Railway Union RFC), Molly Scuffil-McCabe (Railway Union RFC); Christy Haney (Blackrock College RFC) (capt), Lisa Callan (Railway Union RFC), Mary Healy (Naas RFC), Mairead Holohan (Blackrock College RFC), Clodagh Dunne (Old Belvedere RFC), Emma Murphy (Railway Union RFC), Jennie Finlay (Old Belvedere RFC), Jenny Murphy (Old Belvedere RFC).
Replacements: Chloe Blackmore (Railway Union RFC), Vic O’Mahony (Old Belvedere RFC), Caoimhe Molloy (Blackrock College RFC), Elaine Anthony (Old Belvedere RFC), Rachel Horan (CYM RFC), Lauren Farrell-McCabe (Suttonians RFC), Emily McKeown (Naas RFC), Aine Donnelly (Old Belvedere RFC).
ULSTER WOMEN: Dolores Hughes (Cooke RFC); Peita McAlister (Malone RFC), Fiona Tuite (Old Belvedere RFC), Kelly McCormill (Cooke RFC), Fern Wilson (Malone RFC); Toni Macartney (Cooke RFC), Jemma Farrell (Old Belvedere RFC); Hanna Harris (Cooke RFC), Beth Cregan (Cooke RFC) (capt), Aishling O’Connell (Cooke RFC), Taryn Schutzler (Malone RFC), Keelin Brady (Railway Union RFC), India Daley (Cooke RFC), Katie Hetherington (Cooke RFC), Stacey Sloan (City of Derry RFC).
Replacements: Ilse van Staden (Cooke RFC), Sorcha Mac Laimhin (Cooke RFC), Elizabeth McKeever (Cavan RFC), Shannon Buller (Queen’s University Belfast RFC), Lauren Maginnes (Malone RFC), Rachael McIlroy (Queen’s University Belfast RFC), Ashleigh Orchard (Cooke RFC), Jill Stephens (Malone RFC).
VODAFONE WOMEN’S INTERPROVINCIAL CHAMPIONSHIP – ROUND 2:
Saturday, September 4
LEINSTER WOMEN 57 ULSTER WOMEN 12, Energia Park, Donnybrook
Scorers: Leinster Women: Tries: Elise O’Byrne-White, Lisa Callan, Nikki Caughey, Ella Roberts 2, Niamh Byrne, Michelle Claffey 2, Grace Miller, Emily McKeown, Vic O’Mahony; Con: Jenny Murphy
Ulster Women: Tries: Ilse van Staden, Taryn Schutzler; Con: Jemma Farrell
HT: Leinster Women 27 Ulster Women 0