Have they put her on antibiotics after the procedures? What about a crown to 'seal' that area...is that a possibility? If it burst, it may be ready to heal now (w/ antibios)...but if it's burst before, then all bets are off.
Here is a link to the Amer Assoc of Oral Surgeons:
American Association of Oral and Maxillofacial Surgeons (AAOMS)
According to that assoc, and some googling just now...it looks like a Dentist is still the route...at least, that's what I gathered. I don't know just how helpful those dentist locators are (the 1-800 ones)...but maybe try that. I'd def go to a diff dentist though. I hope she gets this figured out soon, poor girl.