How do you help a friend after she's been in an abusive relationship?

About a year ago she broke up with this guy who'd sexually, emotionally & physically abuse her, and intimidate her. She has never told anyone else except me, I've only met her half a year ago and she told me this last month. I try to help as much as I can but I've never been in one so I can't understand what she's going through 100%. All I've done to this point is listen whilst trying to boost her confidence and I feel I've done this well as she told me that she felt I've helped her a lot. However, about a week ago, she told me that she still has feelings for him and at this point I'm lost. I really don't know what is going through her head right now, all I can think of is Stockholm syndrome but that just doesn't sound right. Can someone who has been in an abusive relationship or has helped deal with a friend who has been in one offer advice on how they dealt with it? Is it possible for me to help her get closure?

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