I would leave it in over night. Once a f/t has been thawed, most people throw it away, something about it continuing to decay (I can't remember since I mostly feed live).
You're gonna have to find out how she wants to eat. My female won't take p/k or f/t unless I uncover her, drop it in there and cover her cage. She used to not be so picky, but recently she has been.
Good luck!