I think i had the blister thing it surrounded one of my back mollars i like pushed it with my toungue and it just moved to the other side it was really weird. I just used saline to get rid of it. If that doesn't get rid of it in a couple days then see a doctor or dentist
I agree, don't wait on this, nor should your daughter have to endure this kind of pain at any time, much less the holidays. This can turn serious quickly and you will incur even more expense. Your daughter's in a lot of pain and having worked for dentists I know they can fit you in if need be. I would want to switch dentists anyway!
Your descriptions suggest an anscess. If your primary pediatric dentist is bnot available, you may need to take her to see an emergency doctor or dentist.