Thanks for the query.
Hairs cannot be painful,
These can be an allergic reaction
However nothing can be said without seeing the lesions.
If possible upload a photograph.
For now she can apply a mild steroid
This may 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.