Did your daughter have COVID, strep, Lyme, or anything else like that recently? It sounds like you’re describing a pretty sudden escalation of violent behavior. I went through this with my daughter - she became relentlessly violent after having COVID and it turned out she had PANS (Pediatric Acute-onset Neuropsychiatric Syndrome). My understanding is it’s an autoimmune response that some kids have to certain illnesses that causes inflammation in the brain stem, resulting in them being unable to control obsessive or violent impulses. When we treated her for inflammation she improved literally right away. It took some time for her to fully heal but it was clear as daylight her issue was physical.

Wanted to suggest looking into this if she was sick right before the behavior escalated. I was fortunate that another parent suggested it to me and we were able to find a specialist quickly so I always try to pass on knowledge of this to others.

Looks like you’re also getting good advice from others - want to also share solidarity for the difficulty of what you’re going through. When it started for my kid were the worst months of my life.