3 Years Ago (past-abuser) relatively long article

It might be a very simple thing, but have you told her that you are sorry? If not, maybe its worth saying sorry and let that (hopefully) open the way for an honest talk with her.

It's good that you are getting into counseling, your therapist will be able to help you deal with your own feelings on this, as well as give you advice on what to do in regards to your sister.