Should i confront my friend? or let her find out herself?

I had to confront a friend once and it was about her friends and not much different then what you are going through . I had to tell her that one of her friends was talking to other people and spreading lies all over the school. I told her and of course she was mad at first, but later she was thanking me for being a good friend. I think that you should tell her just to save her the money and the time. She will be offended, but later will realize what a great friend you are.