If you haven't tried live, then there really is no reason yet to bring her to the vet. The vet will make you pay $100 for these simple words "try live".
I know live feeding is not something everyone wants to do, but sometimes it has to be done. I once sold a snake along time ago because I could not bring myself to do it. Now most of my snakes are fed live as I find it easier. But this is your choice. You can bring her to the vet if you feel the need to but I would try live first.