Thanks for the query,
is quiet common in children,
It is usually viral in nature.
However the rash of your daughter is persisting and typical.
Another possibility is allergy
A photograph would have helped in diagnosis.
Please meet a dermatologist
for final diagnosis and treatment
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.