Dsis is struggling with my dn, she is 7 and gets on well with my own dd (8). Dn finds school hard and has very few friends there, dn makes friends easily but then is unable to keep them (she is out of step with other kids). This weekend they came to our house and dn spent most of her time running around the living room flapping a scarf. It’s like a constant repetitive movement, she talks at the same time (seems to be playing). dsis says dn does this all the time at home. Could this be linked to ASD? Is it like stimming?