I think you would need to watch her fairly carefully, if her nappies have already changed to being dryer than normal, even though she's having some fluids, then it's obviously affecting her. If she has any less fluids, I would take her to the doctor. She might have more than just teething issues, like a sore throat. Will she have ice? Maybe freeze some apple juice or something to make it something sweet for her. Or try hydrolite or icy poles or something like that. Maybe give her juicy foods like watermelon and oranges?? Or just have a bottle of milk handy and try to give her a sip every hour or so, like just put it in her gob and hope she takes a few sucks, lol.
Hope she improves soon.