Thank you for your query.
It is very unusual to have hives
from the flu
shots and I have yet to come across a similar case in my practice.
There can be other causes of hives and I would suggest that you consult your doctor for it. In the interim you can put your daughter on promethazine
syrup 1.5-2 ml. three times a day.
I hope I have answered your query to your satisfaction.
Wishing your daughter an early relief from hives.