(((Aztchr)))
I know it hurts but sometimes for some unknown reason it is all a part of the whole process. The good thing is, she went to the bf and told on her self. I remember when my daughter relapsed and she came to me and told me. I told her I was disappointed but was glad that she came to me. She got right back on the recovery horse. I'm sure your sister will get back on track. Don't turn your back on her......I never did. She feels really bad about herself right now. Encourage her and let her know that you are there if she needs someone to talk to.
My best to you and your sister..............Lo