I'm not a super insider into this girl but from comments even years ago by herself, she said she was already forcibly hospitalised by her family for I believe 12 months, and only was allowed out "after negotiating". This was already around 15-16 years old.
This is a girl with long term mental issues (her sister also said so) that finally found a way to kill herself. I also think all these fucking zoomers are semi mentally ill and become convinced by social media shit like "it's over after 20" (big gen Z belief).