Girl is captured and restrained. Whole movie is her being tortured maybe physically, definitely psychologically. Only characters are the girl and her captor. She escapes in the end. psychological horror/thriller. I think the title is one word. On cable repeatedly between 1991-1993.
I believe this is what you’re looking for: http://m.imdb.com/title/tt0114187/?ref_=m_nmfmd_act_36
Maybe Closet Land (1991)?
http://m.imdb.com/title/tt0101597/