I would be talking to a counsellor, a children's specialist
I am assuming this is the adopted chid ? she appears to have some issues, that may need a specialist involved...with specific understanding of her background
that action seems hard....to me.... I may have suggested that it was not nice....or how would she feel is someone spat on her head...
she appears to be angry, retalliating against someone or something... but I have no training in this area....just an ordinary dad