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First, let me say that I am glad your daughter is okay and is in the hospital where she can get the help she needs.
I know how hard this situation is for you, but please know that someone who attempts suicide is in a lot of pain. This was not something she did against you or to hurt anyone in her life. This is something she did to try to stop the pain.
Your daughter is in a safe place right now. She is not along. There are people to care for her. She will probably be there for a few days as they stabilize her medications. Take this time to deal with the situation and to cope with your emotions. Part of your anger is probably the fear of losing your daughter and part is that you feel she let her son and her family down. She did not. She is reaching out for the help she desperately needs.
You may also wonder what you did wrong and what you think you should have seen to stop this. You didn't do anything wrong. You may or may not have been able to see signs of her depression prior to this, if she has never done anything like this before, it probably never occurred to you that something like this might happen. Don't blame yourself, this is not your fault. Your daughter probably has a mental illness and needs professional help.
Hopefully she will come home stabilized and follow an outpatient treatment program.If your daughter allows you to, speak with her doctors before she leaves the hospital and have a plan in place for her to continue treatment.
I don't know where you live, but you may want to check NAMI. (National Alliance for Mental Illness) They offer some support groups and classes for family members dealing with mental illness and can give you more information and support on helping your daughter to get well.
I hope this helps. Please check back and let me know how you and your daughter are doing.
Eileen