She was lied to, but she also wanted to be lied to.
There were undoubtedly people in her life that told her to not do this, but she didn’t listen to them.
Con men cannot con without somebody wanting to be conned.
These people are mentally ill by the definitions that a sane society would use. They are easy prey for irrational ideas like mutilating themselves or even killing themselves.
She was 16. People don’t think things through when they are 16. That’s why they can’t sign contracts. There should be legal consequences for mutilating children whether you can manipulate them into agreeing or not.