Hello i can understand your concern she must be having upper respiratory tract infection like tonsillitis or pharyngitis with vocal cord involvement this can develop due to bacterial or viral infection and an allergic reaction in my opinion you should immediately take her to a paediatrician for clinical examination and a battery of tests like blood for hemoglobin CBC ESR and CRP ( c reactive protein) She may require a course of antibiotics and decongestant medicines under supervision of your doctor I hope you will find my response helpful and informative please don t hesitate to ask for further clarification if need be best wishes