Thanks for your query
From your history it seems to me your daughter is suffering from asthma and recently a perihilar shadow is found on chest x-ray and mantoux test
First of all we have to see whether this is actually a lymphnode or else. For that i advise you to go for a contrast-enhanced computed tomography (CECT) scan of thorax to see whether it is a lymphnode or not. I also advise you to go for a repeat mantoux testing. BCG vaccination
actually cannot prevent TB but it prevents fatal forms of Tuberculosis
like tubercular meningitis
and disseminated tb. Please continue lmontus and ventolin inhaler for asthma control. Consult a pulmonologist
and take his opinion.