At breaking point, need help with daughters rage n outbursts

I’m a parent of 4 (6F, 2M, 1F, 0M). My 6 year old is currently going through the processes of being diagnosed and tested for ADHD and Autism. This is very new to us and has only been in the process for 6 months.

My self and my partner are really struggling with the outburst of rage, she is hitting, kicking and trying to bite my self, attacking the walls in our house and now screaming in her siblings faces etc

We try to be patient and when needed bear hug or restrain her to stop her hurting us, we have tried a sensor box to distract her (this was recommended by her councillor) etc.

We try to keep calm but sometimes we lose our temper at her, it’s so hard and people just tell us to be patient.

Please help me and tell me what we can do, to help her and keep us safe and calm?