What should i do? (instead of moving out?)

This is about my Mom... Sorry its long.

I think that she isn't good enough to be a Mother because she is abusive, immature and unorganized.

Abusive- She is known to shout and yell all the time. She not only hits my siblings but also hurts our house pets with objects such as shoes which I have told her to stop but she says that they need to learn by their mistakes and that I shouldn't be telling her what to do as she is the parent. Sometimes she would tell me that she wants to kill my dad because she thinks hes horrible just like I am. There was also a time when she allowed a man smoke near her while holding my baby sister who was 5 months at the time thats when I was about to hit her.

Immature- I feel like I have to sometimes be the mom to my siblings. Sometimes I have to educate my siblings who are toddlers by learning their abc's and 123's because my mom complains about it being too difficult because my siblings wont listen to her and that shes getting frustrated. Thankfully my siblings listen to me because I step into their shoes and let them have fun as I know what its like to be a child and what their interests are my Mom doesn't.

Unorganized- There are many many times when my mom had to cancel an appointment because she would always take too long in the bathroom trying to make herself look good... Sometimes when visitors come over she would clean the house too late as soon as they enter then she would blame me as I am the oldest.

What should I do?
Instead of moving out.