Hi..
Welcome to HEALTHCARE MAGIC..
I have gone through your query and can understand your concerns..
As per your complain it seems that the symptoms fever,
sore throat, cough and headache can be due to viral infection and seems to be probably due to
Influenza or flu..
Taking Mucinex can help in loosening mucous and subsequent removal as it contains active ingredient Gueifenesin that is cough expectorant..
You should get evaluated by a Paediatricin and investigations like chest x ray, complete blood picture, throat swab culture can help in diagnosis..
She can be given a combination of Ibuprofen and
Acetaminophen for reducing fever and pains..
She can be given anti allergics like levocetrizine, cough suppressant containing
Dextromethorphan and cough expectorant containing Gueifenesin along with decongestant like
Phenylephrine and mucolytics like Ambroxol..
Doing warm saline gargles and steam inhalations will help..
Give her plenty of warm water and other warm fluids..
Give her sufficient rest..
Avoid spicy and chilled foods..
Hope this information helps..
Thanks and regards.
Dr.Honey Nandwani Arora.