I don't want to help my mother out of her abusive relationship
Why wouldn't you want to help your mother out of that situation?
Anytime I try to get involved, it always ends in fights and arguments.
I understand that it might be difficult, but when people are in abusive relationships they can have a hard time accepting help. Your mother sounds like she is in need of help, and so you should do what you can to help her, even if it is hard.
Maybe I should talk to her and see what is happening.
That sounds like a great start. It's good that you're helping your mother out.