HELP THE ME

I was sin school at lunch sitting and talking with my friends then after we start talking about nails I think... then I look at my other friends nails and then I saw her wrist the had many many cuts on the I didn’t say anything because at the time I didn’t realize what it meant. But when I got home I realized then I started to panic I knew that I couldn’t just walk up to her and say “oh hey are you trying to kill yourself that’s not good wanna talk about it” Do I need to let her open up to me what do I do Ik lots of things happened in my life but..... this is even worse than what happened to me I’m so worried that I might not see her on Monday and she doesn’t even have a phone! What do I do what do I do?! HELP!