I'm worried about a friend. We aren't close or anything but just casual friends. Last year I noticed something to do with her and everyone told me I was being paranoid and I didn't need to worry. The things I noticed were she would mimic cutting her wrists in class with scissors and sharp objects (not actually cutting herself), as well as taking pencil sharpener blades out of pencil sharpeners, wearing long sleeves all the time and constantly having plasters or bandages on her wrist. At first I didn't do anything as I was scared and didn't know what to say but a day later after I spent the whole night thinking about it I decided I was going to tell someone and speak to her. That day I told my tutor I urgently needed to speak with her and she said she would find me in my first lesson. It just so happened my first lesson was the same lesson as my friend, except she wasn't in that day. On the way to lessons I confided in my other friend who was closer to her than me and he said my suspicion was right she was indeed hurting herself as was he, though at the time he promised me he'd stopped but that was a lie to stop me from panicking about him. As said my tutor came and got me out of lesson and I told her everything unable to keep it in, she assured me it was the right thing to do (telling her) as she would help my friend the same way she had helped me. When I was back in class, I broke down and started to cry extremely worried about my friend, relieved I managed to get it all off my chest and scared that if she found out she would hate me. When everyone noticed I'd started to cry they ran over to me and started to hug me and ask what was wrong I said the only thing I could: "I can't tell you I'm sorry. It's something to do with someone else and I don't think they'd want me to tell." The TA took me outside the class to ask me what's wrong but I couldn't tell her so instead she got my tutor out of the class next door to speak with me and when she asked me what was wrong I said I needed to speak to my friend (she'd broken her phone and wasn't getting a new one until christmas) but my tutor only told me not to worry. I don't remember what happened next but I was told she had gone to the doctor to get medication.
Then a few days ago in class I noticed fresh cuts on her wrist bandaged up. I was scared what to say and didn't want anyone else to overhear. Tomorrow I have the same class with her and sit next to her and am unsure whether I should say something to her or not.
What should I do? Im really worried about her. Help please
(sorry its so long)