It sounds like you know the trigger, so when you are about to tell her "no", make sure you're close by and grab her hand as she's about to take off to bang her head. Sit her in a cozy corner if you have one, or on a stepstool/ chair away from the wall and tell her that she needs to sit in "chill out time". When she has calmed down, she is welcome to return to play. If she gets up before she has calmed down, she goes right back to chill out time.

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