Hi thanks for your question.
It seems your daughter is suffering pharyngitis
leading to upper respiratory tract
infection. Fever and headache are part of infection..Myalgia
that is pain in muscle and bone is also part of infection. In infection Bacterial or viral lot of toxins are liberated which cause myalgia,fever and headache. She needs a course of antibiotics,antihistiminics and analgesic
anti inflammatory drugs. Consult a physician who may examine her and may prescribe her the appropriate treatment.
Hope this answers your question