Please let your daughter know that you know. expect her to react in a big way, maybe yelling, maybe just a breakdown. let her know that you WANT to know why she does it. let her know that you DO care. I know that it is hard not to want to tell her that it's dumb to do and she shoud just stop, but she wont listen if you do that. I had a father who never noticed that i was depressed or suicidal and all i felt from that was more pain. i wish that he would have sat me down and told me how he loved me and then made me go to therapy. i would have hated him for it at the time, but i would love him for it now