I love my mom but...

My mom had me at an older age, and she has some health issues. She also needs help with a lot of things, and I do try to help her, but she is always on my case, like, "You didn't do the dishes right," or "You need to help your mother out." Sometimes she'll even try to gaslight and guilt-trip me by saying I'm not a good daughter and that I don't love her, but I do. The more she does this, the more I start to resent her. She even gets on me about my dad, who is a deadbeat to all his kids, including me, like it's my fault he's like that. I try to balance helping her and getting my schoolwork done, but she makes it harder to do that, and then she gets mad at me for not keeping up with my schoolwork. I don't know what to do im really trying to help her but in her mind i'm not doing enough.