Over the last few weeks my DD (19 mo) has become increasingly difficult around other children. It usually starts with a dispute over a toy (so far not good on sharing). She hits hard, always aiming for the head. Every time it happens I quickly take her away look her in the eyes and tell her very sternly she mustn't hit other children because it hurts them. Then after a pause I find something new for her to do, some distance away from the other child and let her start playing again.
What I'm doing doesn't seem to be working and I am wondering what else I can do. Today I took her out of playgroup early after the 3rd 'offence' and I will keep removing her from situations altogether if she continues, but I do think she needs to spend time around her peer group too. What else can I do? Any ideas?