Increasing reckless, destructive, or violent behavior from a child with TBI

Part asking for advice, part venting while I hide in my room. My kid, 5, was the victim of abusive head trauma at 2 years old. We have been working with behavior therapists for the last two and a half years. Lots of progress, lots of ups and downs. We're in a down right now.

She's getting bigger. She's still a little kid but she's fast and she's strong and some days it is really hard to physically get myself between her and whatever dangerous situation is coming up. She will kick, and hit, and scratch. She will throw anything she can, pull curtains off the windows, knock over furniture. She will run away, into stores or parking lots or the street. A few moments ago while she was throwing any toy available, she slammed a sharp object into the back of my neck.

These episodes can be triggered by almost anything. She has very little frustration tolerance, and bad separation anxiety from me. She has focal seizures. 80% of the time she is happy, silly, curious, wonderful little kid. But then something goes off course and she escalates immediately, full meltdown, screaming and destroying everything. As much as I can anticipate her triggers and prime a situation for her, we still have these episodes every day.

After the outbursts, she almost "comes to" and breaks down in to these heartbreaking tears, she's scared and lost and embarrassed. She hates these episodes more than anyone else. She knows she breaks things and hurts people, and she doesn't want to.

I am in a holding pattern right now waiting for appointments with Neuropsychologists and a pediatric psychiatrist. Her neurologist is wonderful and we are able to keep her epilepsy fairly controlled, the blended case manager and BHT see her multiple times a week and they are really connected. But still here I am, with bruises on my arms and a cut on my neck listening to my partner soothe a scared, confused little girl who doesn't understand why she can't always control her body.

I don't know if there's some magic strategy I'm missing, something that can help deescalate or "snap her out of it" quicker, or something else I can do to navigate around transitions or just the everyday reality of having to tell a child No that will prevent the meltdown. I'm open to absolutely any advice. I will do anything in the world to help her, and help all of us.

As an additional note, because I will die on this soapbox, shaken baby syndrome is real. It is devastating. It kills most victims, and the survivors face lifelong consequences. And it doesn't just happen to small infants, toddlers and young children are also at risk. One moment of frustration and bad judgement from a caretaker changed my entire family's future. I am forever grateful that my daughter survived, but the challenges she is facing are so, so hard.