Thanks for writing in.
The condition you are suffering is photodermatitis.
It is due to sensitivity of skin to sunrays.
Use a good quality sunscreen of SPF 30.
Retinol creams thin out the skin and cause more photosensitivity
It is better not to use them for her.
Creams with kojic acid
and mild steroid
will be better for her.
Please consult a good dermatologist
for proper examination and prescription medications.
Hope this helps.