Hi, Kalli! I think I may be the Disney Princess of making My Disney Experience Mistakes, so I make a lot of phone calls to My Disney Experience support to get myself sorted out.
Your mom will have to go into her My Disney Experience account and basically remove you from her Friends and Family list. She can do that by going into her Friends and Family section, selecting you, click to edit, and then click the button to remove.
Here's the glitch. If you have active entitlements listed on that account - which your pass/Magic Band may be - your mom won't be able to remove you from her Friends and Family list. I have had hit and miss luck with this kind of thing. I have been able to remove an account for my adult daughter with her annual pass, but not her fiance, who had a multi-day pass.
If all else fails, you can contact 407-939-4357 to speak with someone who can do it "behind the scenes".
For more information, click
Removing Friends and Family from My Disney Experience.
Good luck.