She has a lot of mental issues, obviously she has the stuff like depression and anxiety, but she also has a mild form of schizophrenia. it isnt as bad when she listens to music though, so she just hides in a dark room and listens to music all day so she dosent have an episode. like a lot of people nowadays, she has some childhood trauma (i.e, being beat and verbally abused) she thinks almost everyone hates her and she just stays inside to reduce the risk of her being treated poorly.