I am so sorry you are going through this experience.

I think that my parents would have described me similarly to how you describe your daughter without the cheating and lying. However, I spent my whole high school career suicidal and not telling anyone until I was a junior. So a person can appear okay on the outside and be feeling empty and depressed on the inside. Many cases of suicide attempts happen when others say that there were no signs the person was suicidal. Often the individual as kaliope stated is impulsive (as it sounds like your daughter's attempt was) and is not thinking about the long term consequences. The attempt is to avoid pain instead of end their life.

I know that you think that you child has nothing big happening, but a divorce is huge for a child. That her mom had to go to rehab is a huge trauma for a child. So she has been through multiple traumas. I am not saying that your daughter is bisexual, but GLBT youth have a much higher suicide rate than their peers. Even if she is just questioning her sexual identity it puts her in that category of being at higher risk.

I understand that this has been very stressful for you and her mother. However, blaming her for the stress that this has brought to the family is just going to drive her further away. You two need to process the trauma you two have now experienced independently from her with your own support systems.

Please make sure that she continues to get help once she is discharged from the hospital she and you and her mom will need it. You all need to work together to figure out what is happening.