If she goes to the dentist anytime soon, speak with the dentist or hygienist about her symptoms, and they can see if the enamel on her teeth is wearing away or not, a big sing of purging.

Also, if "bathroom time" is taken away, I wouldn't be surprised if she hides it in her closet. Those with EDs will go to great lengths to control this part of their life.

Please keep us informed.