Wow, thanks so much everyone for your replies, some lengthy (helpful) ones too, so I appreciate it

Yep I have her humidifier on in her room while she's asleep tonight, so far she hasn't coughed! I turned it on 2hrs before she went in... might have to check the water levels later.

I have a morning appt at the doctors to discuss it all. I just hope he doesn't say ' ah maybe....' and nothing resolved!