You talk to her about why you think you hate her, and discuss how you can make this relationship better. Just try talking to her and work it out nicely.
AnswerHate is a destructive emotion, and can do you more harm than you realise - negative mental states can exacerbate stress conditions, and stress, we know, can lead to poor health, lower immunity to disease, and loss of appetite, as well encourage the development of heart conditions, bowel disease, and mental illness. It can even reduce your mental capacity - stress makes you stupid.
It is up to you to take steps to improve a destructive relationship. You may think you hate your sister, but the day will come when you realise either that she is the best friend you could have, or that you missed the opportunity to make a good friend of her.
If you cannot reconcile with your sister, it is also up to you to amend your own attitude and behaviour to best manage your feelings. Avoid confrontation, stay away from arguments, be generous and forgiving, and see if positive treatment improves her disposition.
If it does not, at least (cynically) you can claim to be the better person when things go wrong between you.
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