try a calming bottle. you get like the 1$ water bottle from walmart and fill it with some liquid glitter and other things. if you see her start to do it give it to her and give it a shake.
It is a selfsoothing mechanism . I remember doing this as a child till I was about five .
My daughter did this to there was nothing we could do to stop her eventually she just stopped
I did to when i was young, when i was angry. I used to rock and banh my head on what ever was behind me. I remmeber doing it up into the age of 9yrs old. Sometimes when its get really really bad i catch myself still to this day. I dont know why. My mom said i started as a baby. I guess i turned out alright. I still married to the same man for going on 34 yrs and have never killed anybody…i have never even had a speeding ticket before.
Why don’t you take her to a doctor…
Do you react? She’s learned it gets a reaction.
Need to see an OT. Sensory issues. Trying to regulate themselves