Please try to avoid searching her room and taking things without permission. It's much better if you can coax the permission from her to take them or for her to give them to you. My mom searching my room, completely obliterated what little trust I had left in her, and it was completely useless. It's an addiction. I hid stashes all over my room. She never could get them all, and even in the unlikely event that she would have, I would have been pushed to use other extremes, unsanitized shared scissors, or possibly even blades friends had used, staples and other sharp school instruments. Even my nails were a weapon when nothing was available and those were by far the hardest for me to keep from getting infected. The cutting is a symptom of much deeper issues. Continue in trying to find experienced therapists. Therapists saved my life when I was in high school and the lessons I learned from them still stick with me.