Your daughter seems to be be having an infection again if she has fever
It Is possible that her strep infection has not recovered completely.
It is also quite possible that she now has infection and inflammation of her sinuses
, due to which she is having headache and fever.
She would benefit with a visit to an ENT surgeon , who would be able to confirm the sinus infection
as well as the status of the tubes placed in her ears.
Till you can take her for a consultation, she would benefit with the use of decongestant nasal drops.