[sliken]

Er, unbox, pull the battery tab, open the airthings app, click adopt, and away you go. It shows the sensor readings whenever you ask and will notify you of things like humidity too low/high, CO2 being 2 high "Open a window", and the like.

If mom doesn't want to use the free cloud she might need some help, but it's about as simple as it could be for self hosting, not sure how they could make it easier.