The Rathowen trainer's horse won at odds of 9/1.
Westmeath trainer Adrian Murray was on the scoresheet at Leopardstown on Sunday.
The Rathowen took the Anton O’Toole Mares Handicap Hurdle with She’s Commanche.
Sean Flanagan was in the saddle as the seven-year-old scored a seven-length success at odds of 9/1.
Flanagan said of the 9/1 winner, “She was much happier on that (yielding) ground. She struggles on soft ground. She worked nicely the other day and quickened up well there.”