Baby with Asthma Advice

Hi my 15 month old has a few signs of Asthma as she coughs quite a bit at night time.

It's been going on for quite a few months now and a chest X-ray has showed she may have Asthma

She has just started taking some tablets (can't remember the name of them at the moment) and doesn't really get on with a pump.

My main question would be is it worth getting something like an air purifier or dehumidifier to put in her room at night?

Thanks!