Fayonagh comfortably followed up her Cheltenham Festival triumph with an all-the-way success in the Racing Post Champion INH Flat Race at Punchestown.
After missing the break, Gordon Elliott's mare came from last to first to win the Champion Bumper last month, but Jamie Codd sent her straight to the front this time and she was always in control.
The heavily-backed 11-8 favourite kicked off the turn and came home five and a half lengths clear of Paloma Blue.
Elliott also saddled the third home Poli Roi.
Codd said: "They say when you have a good mare, you should keep hold of her.
"She's a real gem. She likes to do her own thing and I'm just delighted to be part of the whole thing.
"It's special."