Thanks for the query,
She might have developed an allergic reaction
to the products used in therapy.
She can apply a mild steroid lotion like desonide
Also an antihistamine tablet would be of great help.Benadryl
is an anti histamine,
She can take it safely.
This will give her some relief.
Please meet a dermatologist
for exact diagnosis.
Let me know if you have any other doubt.
you can ask a direct question to me on this forum, following the below link.
Wishing you a good health.