It was about this girl who was kidnapped and her abductors were a couple. I remember it being in a trailer park setting, at one point in the movie they hid her in a drawer under the bed. When they let her have a run outside, they manipulated her into thinking others in the community park were in on the kidnapping. At the end of the movie the wife/girlfriend lets the girl go at a bus station and admits no one els was in on the kidnapping. Actually i think the gf says she was kidnapped as well.
It could be an adaptation of the real life kidnapping of Colleen Stan.
I remember that she was kidnapped by a couple and they kept her under their bed.