Thanks for the query
As you have mentioned it seems that she is suffering from some kind of upper respiratory tract
infection, it may be viral( more common) or bacterial. Most of the viral illnesses are associated with rashes. Chances of rashes after having antibiotics is also there but not very common. So just observe for any increase in rashes or persistence of fever
. If it is not improving or increasing in severity consult your doctor.
I hope this answers your query