Dash,
I'm old enough to remember Patty Duke, and there was a period in I think the early 70's when to everyone observing it, it looked like she was on drugs, or was drinking, was a drama queen, etc. At that time, most people her age experimented with drugs anyway, but her reputation really suffered. She made a rambling, nutty speech at an awards show, she got pregnant with Desi Arnaz Jr.'s baby, she was hypersexual, and had a lot of drama in her life. Everyone chalked it up to her being a temperamental actress with attention seeking self destructive behavior. She ticked off directors and actor colleagues with her lateness, mood swings, etc.
Turns out she was bipolar, was diagnosed many years later, and she was suffering all that time. She spoke candidly about it and has been successfully in treatment for a long time, and she speaks out to help others. When I think about your daughter's note, then her coming home and singing at the top of her lungs, then her Tumblr post, it just reminded me of Patty Duke for some reason. I hope this time, your daughter. continues with the sessions long enough to get a handle on what her real issue is. Hugs to you, Dash, it's gotta be a rollercoaster for you.