Third in the Curragh Group One, the Aidan O’Brien-trained filly made virtually all the running as she went two places better in this Group Three heat over seven furlongs.
Foxtrot Liv tried to keep tabs on her, but was comfortably held by the 5-4 favourite, who crossed the line two and a half lengths to the good under Ryan Moore.
Mick Channon’s British raider Chynna was three lengths away in third.
Hermosa could now head to Newmarket for the Fillies’ Mile on October 12.
“She’s a lovely filly and she’s coming with every run,” said O’Brien.
“She’s a lovely, laid-back filly and is learning with every run.
“I think she’ll go for the Fillies’ Mile. She crying out to go up to a mile.”
Hermosa was completing a quick double for O’Brien and Moore following newcomer Magna Grecia’s success in the opening seven-furlong maiden.
Sent off the 2-1 favourite, the 340,000 guinea purchase showed a professional attitude to sneak through a gap on the far rail, after being just off the pace in fourth place, to grab the lead in the final furlong.
“You’d be delighted with that, he’s a lovely horse,” said O’Brien.
“He was just ready to start today. He’s a possible for the Killavullan or something like that.
“He’s a big, powerful, strong horse. I don’t think you could ask him to do more than that, he was green but when he got straightened up he found plenty.”
Betfair gave Magna Grecia an introductory quote of 33-1 for the Investec Derby.