Oh, @razorclams, my heart goes out to you. What a difficult place for any parent to be. There is nothing I can say except to let the medical professionals do their work and be as supportive as you can be with their help and with God's help. Do you have other family members/friends nearby to support you? I hope so. Depression is such a difficult and frightening thing to experience. It is difficult for your daughter as well as for you.
Please post again and let us know how you and your daughter are doing. Praying for you.