Hey @noahv2, welcome to the community!
Sounds like your mother linked her Facebook profile to your Spotify account.
Don't worry, you can follow these steps from the desktop app to disconnect your Spotify from her Facebook.
Once it's done, your account will go back to your username, instead of her profile name.
All the best.
“Music acts like a magic key, to which the most tightly closed heart opens.”
― Maria Augusta von Trapp