That does sound weird. My first impression was RI, but it doesn't really sound like that. Did she actually regurgitate anything? Or did it just seem like maybe she was trying? Has she eaten anything at all in the last month? Are you feeding her f/t or are you still trying to feed live? How often have you tried to feed her?

What is your set up like? Temps? Heating method and control? Cage size? Humidity?

I know these are a lot of questions, but answers will help us help you.

These signs do sound similar to initial symptoms of IBD. I am not one of those who sees IBD in every sick boa - in fact, I think IBD occurs far less than we think it does. However, these symptoms are similar and should not be ignored. I would immediately seperate her from the rest of your collection and put her back in strict quarantine - at least until you figure out for sure what's going on.

Sounds like you don't have a lot of faith in your current herp vet. I would do some research and try to find another vet that has more experience - even if you have to drive a ways to get to one. My own herp vet is 45 minutes away from me. It's not ideal, but worth it to know you're getting your snake good care. So if you can locate one within driving distance, I would take her there asap.