I dont know if I like her ?

Im friends with this girl , but I dont really like her. She has started to smoke weed and drink. I know that she has a really tough life but that isnt that way you should deal with it. I dont know if I wanna hangout with someone like that. Im am so much of a goodie girl. If I get mad at her my other friend will get mad at my to. I just dont like her at all. I dont know what to do. I dont want to keep on predenting to be her friend ? Help !