2) Underwater by Marisa Reichardt. This beautifully paced YA contemporary explores the situation of a girl suffering from agoraphobia after a trauma. Like Challenger Deep, it does a great job of getting you in the mindset of the mentally ill individual so that you can better understand.
3) Still Life with Tornado by A.S. King. This odd YA magical realism tells the story of a girl suffering from depression and a bad home life and how she starts seeing different versions of herself from throughout time as she tries to come to terms with her situation.