I attempted at 15, for about 1.5 years prior had cutting behavior. I was going through a major life upheaval. Didn't do the hospital route, back then myself. And I wouldn't quite say that I wasn't unhappy, but was happy go lucky even back then. But wouldn't say in a detached way, could voice my sadness and displeasure in life, back then, I just didn't voice that I wanted my pain to end.

Your description of your daughter, doesn't sound relatable for how I was. However the rest certainly sounds worthy of extra observations by her counseling team. Does sound like something underlying there, not just environmental factors.

You've some good support here. Much needed as your family deserves support.