I actually managed to find my mom's fetlife account on her laptop
What's in it? Why did you want to find her account?
I'm so pissed off at her, she banned me from her facebook
I understand that you're upset at your mother for banning you from facebook, but it's wrong to snoop around someone's personal property just to find their private accounts. If they found out they may feel like they can't trust you any longer and they may ban you from other things.
I'm not going to give a damn if she kicks me out too.
I think it would be best if you take a little breather before you do or say anything more hurtful to your mom. She deserves privacy as much as you do, so don't you think it's fair that she prevents you from looking at her FB if you snoop so much? How about apologizing to her and making up for it?