Hate my sisters habits, what to do?

How could you get rid of sisters habits that you don't like?

Talk with her and see if something can be worked out...Take care !!

either talk to her
or focus on the things you like about her

You cant change another person... and you're going to have a miserable time if you try... unless she wants to change, nothing you do will change her (especially considering you're not her mother). Perhaps point out how her bad habits make her look bad to other people?