Can she use a seldom used device for a Hotspot?All you need to do it get a home router just like you were going to connect it to the internet.
Then don't.
Set it up without connecting to an internet box, and all your WIFI devices can use it to talk to each other.
Oh, if anyone needs a small device for a remote for all this, Amazon has their little Fire tablets on sale - $39. I just got one and they're nice. I imagine it could be made into a Hotspot /range booster for WiFi.
Converts to Google stuff also.