Hah! That will teach me to check for a second page before I post. I didn't read you had already tried the stores before I posted. Sorry. ;-)
I am thinking that will be enough. She has food in there, so she wont starve. You have seen that she will eat, so no problem there. Every other day for now would be fine. I have seen mine goes days without eating. (Kinda upsets me when I waste turtle pellets like that, as they will get old after a day or two.) Also, turtles hibernate. I didn't allow mine to hibernate completely last year, because of her problems. (You never want to let a sick turtle hibernate, so I have read) But during this time she would sleep alot and barely ate at all. I was concerned, but its been about 2 months now that she has been up and active and eating daily again.