Continuing cough and cold. Montair lc.

My daughter is 5.5Years old...she is having cold and cough from 3weeks.. previously she was prescribed Alex ls and augmentin DDS..her condition didn't improve..later I started with Tulsi leaves water with honey ginger and other spices..after that started noticing  phlegum inside chest was coming out through nose ..but still little cough was there so I consulted with doctor again ..doctor gave montair lc and hhlinctus ls cough syrup...she is already taking these meds for 3days.. phlegm from nose is not coming out anymore..seems like congestion is there in the chest...is it becos of montair lc ..should I stop giving this medicine..? Pls Kindly suggest...doctor told to give it for 10days...m getting afraid as the phlegum is not coming out anymore..and having cough also..should I stop montair lc..?kindly suggest..Thank you..