I agree. This protects both you and her. If it is a ploy to manipulate you, if you consistently do this, she will stop. When I was suicidal, I didn't tell anyone (except one time and I went to see find help the next day)--I didn't want anyone to be able to stop me. Not everyone may act like this so report it so that you will feel like you did what you could. You would feel bad if you didn't and something happened.