Thank you for your query.
does appear following fever
in most of the viral infections. The duration of the rash can vary with the viral infection. As you have not mentioned the duration of the fever and age of your daughter it very difficult to say which viral infection it could be. It is very unlikely that the rash will re-appear.
You are doing the right thing by getting your daughter examined by the doctor.
I hope I have answered your query to your satisfaction.
Wishing your daughter an early recovery.