I think I don't want to have anymore contact with my sister
Are you seriously thinking about this? Why do you not want to have contact?
I don't trust her and she's always been a mean person. She has a big mouth and a smells like a pig.
It's understandable to not be around someone you don't like, but its rude to avoid a sibling and insult them behind their back. It can cause you to grow even more resentful and drift away from their lives.
I don't care. If that's what happens, so be it.
People in the same predicament as you will always say that, and people that end up fixing their relationship will always tell you it was so worth it. It might be hard to take that first step towards forgiveness, but she will always be your sister, and if you ever get into big trouble, I bet she will have your back. That's how it always works out, so maybe give your sister a chance.