I don't think it's a very likely possibility. It's not just a mind thing. Without blood, maybe not at first, but eventually, the vampire will weaken and wither away. They also physically need it. The 'mind over matter' thing is resisting sweet human blood, but it's still necessary to have blood. But what do I know. I don't know a lot about Meyer's vampires since they are nothing like I've ever heard of before. So most likely I'll be totally wrong.
I personally think that her resistance to vampire powers will be intensified and she'll also be immune to the physical powers, so she won't be able to be touched by any vampire.