Sounds like she’s configured your server as her preferred/main server (probably from when you helped her with the initial setup).
You should be able to add other hubs from each library’s Recommended page to the home screen from those libraries’ Recommended pages (hover over the hub title and click the + to add it to the home screen).
…I need this to get the correct “on deck”. I have had a look at the .ini file in /Application Suppport/Plex and I can see it is there. Deleting that file and restarting Plex (for Mac) made no difference though.