Happily was operating on a different level in the Jockey Club Of Turkey Silver Flash Stakes at Leopardstown.
Aidan O'Brien's daughter of Galileo claimed a Curragh maiden in June and really caught the eye to win this seven-furlong Group Three.
Easter Lily made most the running, closely tracked by Dawn Delivers and then Happily, the Ryan Moore-ridden 8-11 favourite.
The latter was nudged wide as the field straightened for home and coolly gained a definitive lead she would not relinquish.
Happily showed marked improvement the further she went and was much too classy for Shalailah, who was also second behind the O'Brien inmate at the Curragh.