I haven't had this issue with my son, but I have always been sensitive to chemical smells, and sometimes when I am sick everything bothers me like you mentioned your daughter feeling. The smell of foods that don't normally bother me do, and water totally tastes off (and I drink a lot of water all of the time), I get super sensitive to everything. This doesn't always happen when I am sick, I think it might be related to a light stomach bug, since it isn't like I get really sick, I just feel gross (stomach ache), have the sensitivity, and then I'm better in a couple of days (maybe once every few months). I don't think it is a phase for her, I don't think she can control it, but I'm sure it will pass. Don't worry too much unless it goes on for another week, then maybe take her to the doctor.