(Sorry this is so long in advance, had a lot to put out there!}
Of course, anything to help. I can pin down a few things that helped (many may not relate to your and your daughter's situation but I hope some give you an interlinking idea or hope).
- Leaving school. This was the biggest one, I really and truly hated the regimented schooling system and it majorly worsened my feelings of being out of control. I can only liken it to a prison in that I felt like I couldn't escape it and I was treated like an inmate by teachers / not supported in leaving by family. Very dramatic in retrospect, but truly school for me worsened my already-bad feelings of being trapped and everything being completely pointless.
- Finding more people who loved me and wanted the best for me. So for me this was finding a partner who truly and deeply cared, and everytime I wanted to hurt myself or die I thought about him and the ways it would affect him if I did. This didn't stop my desires for self harm or suicide, but it managed to break what had become a habit of and I realised I could push through the negative emotions without hurting myself.
- Getting on Sertraline and getting off my birth control. I didn't realise quite how drastically my mood was affected by being on birth control and not being on the right medication. I'm not on Sertraline anymore - I only took it for maybe 6 months or so, but I remember consciously thinking; "If this is how other people feel all the time, they've got nothing to complain about" . It's not a miracle cure by any means but even having the placebo effect of a pill to make you happy can make you happier.
- Getting diagnosed! I've got autism, anxiety and depression and before I had a doctor predict that I did actually have something wrong with me I felt like I was mad in a way that no one else was (which of course only worsens your feelings of isolation). The knowledge that none of my mental health issues were actually my fault and were a product of trauma and biological factors brought me out of my self hate spiral a little bit.
- Giving up on CAMHS completely and instead getting private therapy. I know it's not an option for many, but I mean it when I say that CAMHS itself is overworked and underfunded and makes you feel more alone. If you have any capacity to go private in any way, I truly believe it will be more effective - higher cost financially, but without the cost of your daughter's mental health.
- Figuring out the root of the issue. For me, it was emotional trauma from my childhood and family issues (which worsened my feelings of isolation and never being understood) which I managed to resolve by cutting contact with my family. This is obviously a drastic option, and I'm by no means recommending your daughter does this, but drastic options can be the kickstarter for change. Is there anything in particular that makes your daughter feel bad / things that worsen her mental health condition(s)?
People often hold onto this idea of "don't run away from your problems", which under usual circumstances I agree with, but suicide is not a usual circumstance.
- Developing coping mechanisms. So for me, this was not accepting putting myself into situations of high anxiety or doing things to "strengthen myself" that were actually very damaging. I give myself full capacity to leave situations if I need to, and I only hang around with people who will respect this.
Additionally, finding distractions from self harm - for me that's pencil drawings (a hobby I thought I would always be terrible at, but I really enjoy and I'm actually quite good) which is the first thing to do when I feel like self harm. For me personally, I have a checklist when I want to hurt myself; it usually goes (in this order)
- make something creative
- have a bath or practise some easy and ritualistic self care
- go out for a walk or out to do an activity
- do anything I can to prevent myself from self harming, even if it involves spending some money or eating unhealthy food
- call the Samaritans or NHS mental health if things get this bad and I can't stop myself
These are the things I did to get better. However I want to put out there that recovery is NOT immediately getting better. I still have a suicidal instinct and a drive to hurt myself sometimes, but the ratio of these days to "normal days" is much lower (and I've developed skills to protect myself when it gets bad). Now, on the whole I'm a happy person, I feel joy in my life and I don't actually want to die even on my worst days where I feel tempted to commit suicide. I never thought I would get to this place ever - I never even thought I'd make it past maybe 13 given how early my issues started. I'm truly even surprised with how OK I feel now that I managed to survive all of that stuff.
If you'd like to PM, I'm more than happy to talk about my experiences or offer other stuff I did to get myself out of the mental illness spiral - I know how hard this is for you and I know how hard this is for your daugher. The best thing you can do is try and get some support for yourself, and keep listening to your daughter about what she needs and supporting her. Best of luck to you, and I'm sorry you're experiencing this