You have my sympathy, but if you want help finding a solution you should put more effort in describing the problem. Now it's unclear.
JQBX is not playing any music itself; instead it just controls what song plays on Spotify.
Go here: https://www.last.fm/about/trackmymusic, scroll down to Spotify and press the 'connect' button. Follow the instructions to allow Lastfm acces to your Spotify played songs.
On your Spotify account under apps (https://www.spotify.com/us/account/apps/) there's a list. It should now show "Last.fm Scrobbler".
If that's all set up, test play some music on Spotify on all your devices. Check with Last.fm (via the website or the app) to see if played music shows up as 'scrobbled').
Hope this helps. Good luck
i know you're asking for Spotify based app, but there's this site watch2gether that lets you do pretty much everything you've just asked for but using youtube as its base. and since most of the music that is on spotify can be found on youtube i figured maybe it may be usefull for you and your gf, cheers!