She showed moderate form as a two-year-old in 1974 but mage great improvement in the following spring when she won the Athasi Stakes and then recorded a five-length success in the Irish 1000 Guineas.
[2] On her three-year-old debut, Miralla was ridden by an apprentice jockey and started an outsider for a minor race over seven furlongs at Phoenix Park Racecourse but belied her odds by taking the lead in the last quarter mile and winning by four lengths from Passer Queen.
Ridden by Ryan "Buster" Parnell,[5] Miralla tracked the leaders as Music Ville set the pace before moving up into contention in the last quarter mile.
In June she was sent to England for the Coronation Stakes at Royal Ascot but looked extremely ill at ease on the ground and finished sixth to Rose Bowl.
She was racing on soft ground for the first time since the spring was required to concede weight to her sixteen opponents and finished ninth behind Sea Sands, beaten six lengths by the winner.