Do you know of such a horror or thriller?

It's about a woman who was trapped in the woods. I think she was oppressed there by a guy (he was masked, I think), when she finally escaped it turned out that she was actually a junkie and someone had done this kind of aggressive rehab on her. It was more about one woman. I don't remember the beginning or the exact end. All I know is that some woman was held in the woods, normally as if the abuser was waiting to drag her there because he had prepared everything, locked her up somewhere, oppressed her and probably beat her. And when she escaped, she ended up in a hospital, I think, and they examined her there, and she said she was kidnapped held, but the tests showed nothing. Except for drugs in her blood and when she led the police to that place where she was imprisoned - they found nothing. And in the end, supposedly someone from her family kept her there to just wean her off drugs.