Stuck Inside A Dungeon

For the past 2 weeks, my girlfriend acted differently. We argue most of the time. After a huge fight, she cried and cried all day, and she tried to sleep. She talked while in her sleep saying, "I want to go home, can you please let me go.", in a polite manner. She also said that she is playing with 2 people in her dream. So I talked to her ear and told her to go home to me. If she can hear my voice I asked her to talk to me. Then she woke up, started to eat and suddenly she told me while she is sitting she felt she just woke up, and telling me she can't wait to watch the debate on tv, but in fact that debate was 2 weeks ago. I told her that, and shes doesn't believe me. I told her things that we did in the span of 2 weeks but none of them she remembered. Then she felt sleepy, and someone used her body to talk to me like a spirit. She kept saying if I love her, she is the one using her body. She is better than her and that. But I was so terrified on what's going on. Then I convinced her that she can't replace my girlfriend, she told me that my girlfriend locked herself in a dungeon, and she looked so pale and there's a box that filled with memories, really bad memories. Her deepest darkest secret she hid it in that box. It was open by that time and she doesn't want to go out. The spirit is now helping me to take her out but she doesn't listen to us. She has a video in that dungeon about our happy memories, she kept it. Her hands and feet were chained. One day, she talked in her sleep again and she told me I was the one who chained her there, she wants to go home. I tried massaging her hands and feet, telling her I'm trying to take her out, break the chains, but nothing happens. Everytime she is awake, she felt her hands and feet were pulled, as if she is burying her self, that she wants to cut her feet. The spirit told me to not let that happen, and she is holding her hand so she won't be alone in that dungeon. Please help me. I want to save her. When we walked outside, the spirit told me that it gave them light inside that dungeon but it still not enough. I want to break that chain so she can come back. Please help me guys.