Peamount returned to top of the Continental Tyres Women’s National League table after being displaced by Wexford 24 hours earlier but were made to work hard by UCD Waves for their 1-0 victory at Jackson Park.
Heather Payne scored the game's only goal and struck just before the hour mark as the visitors withstood a spirited finish from the.
Áine O'Gorman forced the game's first save when she steered Payne's cross on target, but it did little to trouble Erica Turner in the UCD goal.
With 12 minutes added on for an injury to UCD winger Caolán Carroll, the home side almost took the lead as the clock ticked towards 45.
Peamount keeper Naoisha McAloon spilled a cross and Sophie O'Donoghue steered a shot back across goal, before Carla Moran managed to hit the post with the goal gaping.
The Peas upped the tempo after the break with both Karen Duggan and Lucy McCartan having chances on the back of pressing high in midfield.
There was a sense that the goal was coming when Payne ghosted in behind Katie Burdis and, after Turner denied her with a sliding challenge, the striker slotted the loose ball into an empty net.
Wexford Youths had overtaken Peamount on Saturday with a 3-1 victory away to Shelbourne Ladies, topping the table for the first time this season.
Internationals Rianna Jarrett and Claire O'Riordan scored either side of half time in front of the watchful eyes on Republic of Ireland senior manager Colin Bell.
O’Riordan’s goal in particular was a poor one for Shelbourne to give away as the Dublin side were again exposed at a set-piece but Pearl Slattery gave them some hope with a late header.
Shels pushed on in search of an equaliser in the closing stages but Wexford sealed it in injury time as Frawley intercepted Lynn Craven's poor pass and teed up Parrock to finish with her first touch of the ball.
Elsewhere bottom side Kilkenny claimed their first point of the campaign as they battled their way to a 2-2 draw with Limerick.
In the weekend’s other game Cork City proved to be too strong for Galway, claiming a 3-1 victory that leaves them five points off top side Peamount.