In case the symptoms have not subsided at the end of att. Get the sputum examination done for afb staining and culture dst for tuberculosis
. Fibrotic changes on xray are an indication of healed tb. However if the cough
does not subside even after a course of 2 weeks of antibiotics, you need to get her investigated further in the form of sputum examination / bronchoscopy
/ ct scan
thorax (as per the requirement as assessed by the Pulmonologist.I hope i have answered your query. Take care.