Secret Agenda has made a winning stakes race return at Caulfield, but her trainer isn't getting too ambitious.

Mick Price said while there was improvement to come from the daughter of Not A Single Doubt, he will be keeping her to mares company after her win in the How Now Stakes on Saturday.

Ridden by Damien Oliver, Secret Agenda was backed from $3.20 into $2.80 favouritism before scoring by 2-1/4 lengths from rank outsider Every Faith ($91) with Exclusive Lass ($17) a half-head away third.

Secret Agenda was having her first outing since finishing fourth in a Group Two race in Adelaide in May, but Price said the mare had been working and trialling well for her return run.

"Her winter coat is in two phases at the moment," Price said.

"It was good that she won and she'll definitely improve and the give in the ground is the key to her.

"With her rating she can race in every black-type mares race over 1200 metres."

While Price is keen to keep Secret Agenda in mares company, Oliver suggested, while the tracks remain on the wet side, she might be able to get away with a race against the males.

"I think mares is the key to her but on a soft track she might be up to something a little better," Oliver said.

"It was a pretty slowly run race but she was in a nice controlling position all the way and she had a nice turn of foot."