thanks for your query
History seems that your child is suffering from Exanthematous illness, its a systemic viral infection, affects mainly skin and oral mucosa
with flue like symptomatology.
Treatment for this is just supportive and no need of antibiotics as you given 1st round.
If she had fever
give antipyretics Like febrex plus along with antihistaminics
Also give her multivitamines and apetizers that will boost the immunity.
Many thanks, take care. bye.