Hello and thanks for the query
Firstly I want to know
1. how the fever starts, does she has cold
, throat infection
, UTI etc?
2. For how many days are you taking antibiotic and how many antibiotic you have taken?
3. Is fever continuous?
4. Other related symptoms except fever?
Have she is investigated for Rheumatic Fever
or not. Rheumatic fever usually occur at this age and persist for such a long period. Consult your doctor for this and go for ASO titre test if not done and other clinical examination.
I think you have been not diagnosed yet, so have a diagnosis and get treated.
Hope this will help you.