Did you try to use vegetable oil or mineral oil to get the cup off?

I would just rub some neosporin on that to help it if it's sore for her, but I'm sure it will be fine.

Snakes break ribs all the time in the wild and it's really not a big deal for them. If she broke one, I doubt it's going to hurt her. That vet sounds like a dumb-a$$.

P.S. On a better note, she sure is a pretty girl!