my son has idiopathic angioedema which started during at 13/14yr. wakes up with swollen, face, lips, eyes lids , tight throat. Recently at 19 had slightly swollen tongue.
He has it controlled with 3 antihistamines when really bad, and should be on 2 types a day at least. It peaks during stressful times and illness.
I know this isn't what your daughter has, but this stuff does seem to happen to allergic teens. my non food allergic daughter started with her milk allergy at 13, and thankfully its burning out at 17 now (long story).
It took 6 months to get this condition confirmed and sorted. It's difficult, and scary to deal with and watch. I hope things get better soon for your daughter.