To Find Myself

If theres some bug in this game, please tell me in the comment section. Story: Rhenanda wakes in a room with a case of amnesia. She hears a voice telling her she should leave, as it is not safe. She finds the door locked, and the voice speaks once more: "This place is not my territory. Beware of the ghosts inhabiting it!" What does this voice mean by "its territory"? Is this place really haunted? How did she even get here in the first place, and how can she leave? Also, where is this voice comin...