NC-ed for this, I don't wwant dd to connect me with my other posts (if she ever read things on here)
I so understand how you are feeling, I was exactly where you are 10 years ago. And with all the same feelings of shame, guilt, bewilderment and anability to do anything.
fwiw I'd trust the what the school are saying. I know that you feel it is not normal, but the school will see a lot of troubled teenage behaviour, some of which will include self harm in various ways. The fact that your dd's school has provided her with counselling is good. When my dd was self harming the school did the same, and it was the school counsellor who said that in her experience my dd's self harm was beyond their scope and made GP and CAMS referrals.
Both of those were difficult for my dd. The GP prescribed antidepressants and referred to a psychiatrist, and for my dd the CAMS service felt horrible. She felt scrutinised and judged and 'talking' therapies were exactly what she wanted to avoid. I have no idea what might have been any better for her, I just know that neither of those felt good (even though they were caring and lovely people).
When I read your post, I could flip back in an instant to how utterly useless I felt. Like you, knocking on her door to ask how she was was met with abject rejection and hostility. However, even in her desperate state I was reassured that when she felt at her worst she called me up and asked me to get her and bring her home. I was without a car that evening, so I had to go in a taxi for miles on a drak and rainy night. She sobbed all the way home in the taxi, and I brought her into the house, tucked her up on the sofa and just stroked her head as she cried and cried. She was such a sad, sad, girl. But still, she had called me.
I never felt really secure in that though. I knew that in addition to cutting herself she had had suicidal thoughts, and whenever she was not actually in my sight or hearing, I felt like I never knew whether she was actually alive or dead. That's not something you can live with on a daily basis so I had to let go of that kind of thinking a bit.
My dd was very artistic and in my desperate hunt for some reassurance, I found in her room a sketch book that she drew in. The pictures were both beautiful and macarbe - drawings of knives and blood, artistic words, the lyrics of poems and songs related to hate, love, death, cutting. I took some reassurance from the fact that she had another outlet for her overwhelming feelings.
The one thing that did make a difference to her mood was physical activity. Whenever she wanted to go for a walk, I would drop everything and go. Sometimes she would say a few words, sometimes she'd say a few sentances. But somehow walking alongside her was much easier for her than having me sit across a room and look at her. And she discovered for herself that skipping downhill (not with a rope, the kind of joyful skipping that a little child does) gave her some momentary relief from her black feelings - she coudl not skip and simultaneously feel like death.
I can't quite recall when this seemed to be better. It probably took a couple of years. But it did get better, and she is lovely, lovely kind and thoughful adult, in a secure and loving relationship with her boyfriend.
I apologise for the long, long post. But I've been where you are and I know how scared and isolated I felt (I was pretty much unable to tell most of my friends), and I longed to talk to someone who had experienced the same.