I experience the same thing, even when i don't get my wires changed. what kind does she have?? I've got smartclip (which are said to be more painful) however they are quicker and i decided that's what i wanted. Anyways i've used motrin, tylenol, advil and others (not all at once!) but they didn't really help, and the wax didn't either. What i've been doing after adjustments is using my tongue to press firmly against my teeth. I don't know if it's okay to do, but it helps me alot. What you could also do is tell her to just close her mouth firmly together, i know it sounds weird. But i asked my dentist about it and she said as long as i'am not doing it at night or grinding it would be fine. Hope she feels better,
preciouschild