Your daughter sounds very much like mine was. Honestly, so similar.
We are coming out the other side now and she feels like my daughter again. For a time I felt she was lost to me and our relationship would never recover.
I also think my daughter is on the ASD spectrum. We had an emergency CAMHS appointment but we did not seek assessment in the end as my daughter chose not to. But I think from what I have learned about the condition, she probably is on the spectrum.
Hang in there. It will get better. What helped for us was we got her counselling. She has probably had counselling for around 18 months but worth every penny. We luckily had BUPA cover which paid for some of it. Counselling (CBT) gave her an outlet and a private space to really talk and develop coping strategies. Now, she has a 'calm box' in her room with sensory objects in and different types of lighting. So she has learnt to self regulate and stop herself to the point where she is just totally overwhelmed. I know there are also online counselling services which can be accessed.
Also, definitely worth looking into your daughter going on the pill. This has helped my daughter's hormones level out and has made a difference. She will say it has too. Less extremes of emotion.
Keep reminding your daughter how much you love her. I'm sure you are but I really don't think they can hear it enough. Grab any opportunity you can when she is regulated to do stuff you would both enjoy - go for a coffee, watch a film. Anything to keep lines of communication open.
Lastly, be kind to yourself. I felt like an utter failure and genuinely felt frightened of my daughter at times. It will get better. Keep asking yourself what is behind her behaviour, this helped me to try and understand her.
Someone told me once that girls, who are possibly ASD, have a form of PTSD when they are teenagers due to the sheer exhaustion of masking and fitting into a society which is difficult to navigate. This really resonated with me and I think describes what my daughter went through.
My daughter will now openly say she doesn't know how I put up with her. I do think they push the one they love most because they know you are not going to stop loving them, you are their safety net. Hang in there.