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Your daughter is having fever for last 20 days and there is no cause is detected yet such fever are known as Pyrexia of unknown origin and need proper examination and investigation to detect the cause of fever.
In such cases patient should be hospitalized and investigated depending on examination.You can take second opinion
PUO may due to following
1)infections like hidden abscesses, endocarditis, tuberculosis, and complicated urinary tract infections Malaria Resistant one.
2)connective tissue diseases like temporal arteritis
and polymyalgia rheumatica
, Still's disease, systemic lupus erythematosus
, and rheumatoid arthritis
3)Lymphomas, leukaemias ?
Relevant investigations like Ct scan, bone marrow,anti nuclear factor, RA factor Echocardiography and ultrasonography repeat x ray chest.
Hope these will find the cause and treatment depend on cause.
Hope this helps.
Dr.Akhilesh Dubey M.D