My 12 Year Old Daughter Got Braces About 7 Weeks

my 12 year old daughter got braces about 7 weeks ago.About 2 weeks after she got them she started experiencing over salivating. It has gotten increasingly worse to the point it interferes with school and activities. I looked in her mouth and her tonsils are huge! Took her to pediatrician and they said she would have other syptoms if it was toncilitis?Took her to to orthodontist and they said they have never seen this problem? Can you please help us???