I want to tell my sister to grow up
Why would you tell her to grow up?
She stole all my money and she laughed at me
It is okay to have issues with your siblings from time to time. In addition to telling her that she needs to be more responsible, you should aim to set a good example for her yourself.
She is gonna start hating me now so I don't care.
Well if she stole money from you then she isn't being a very good sibling. You need to have a talk with her and figure things out.