Thanks for the query.
Probably she is suffering from a viral infection called as rubella
You have given a typical history of redness
of eye and rash
appearing behind ears.
Dont worry it is self limiting and needs just symptomatic treatment
Please meet a dermatologist
and discuss regarding this.
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.