When a person is depressed, they often feel hopeless and do not recognize that they may feel better in the future. Psychiatrists can realistically instill hope. Things you should do immediately or removing guns from the home, any old medication that may intentionally or inadvertently be saved up, limit or stop alcohol use, and let a trusted family member or friend know how you were feeling in that you could use their support.
Nearly everybody gets better with treatment for depression, although it may not be the first medicine that works, so hang in there!
Your daughter may need some lessons, perhaps from a therapist, about empathy, understanding the impact of her behaviors on how she is viewed by others, and developing trust from her parents which she will need to be trusted with other privileges as she gets older.