I hate my sister and I always have. She is making losing my father harder.
Why do you hate your sister?
She is a bitch. Plus, she has bad taste in clothes.
Hating someone because they are not so nice is sometimes understandable, but her clothing style is not a good reason to hate her. If you don't try to work things out, then you will miss out on a more functional family existence with her.
I'm not going to talk to her. She can't change so I'm giving up.
Don't give up on your sister. It's not good that you have come to hate her and your refusal to talk openly with her and try to make things right also is problematic. Give up your small grievances against her and sit down and work things out.