Hi,
Swollen neck with swollen tongue can happen due to certain viral infcetions, hypothyroidism, Hashimoto’s disease, hypersensitivity reaction to certain antibiotics especially if not taken before and allergies.
I would recommend that you encourage your daughter to consult a physician for complete evaluation nad confirmation of the cause for this. Best.
Allergies! I am allergic to dairy and just by eating one cookie (which has egg) my throat and tongue get like that. If I have more or add another dairy product I get the swelling and hives!