I am worried about my daughter's social skill too. I found out that she is always alone at school even she claims she has a few boy friends. In fact I don't mind her playing with boys but I am scared that the boys won't want to be her friends later. (it is common for children to divide into boys and girls once they reach a certain of age. sigh...) It means she would be left out totally then...
I know adults can't do anything to help while it is somethings they must learn and deal with by themselves. :(
Teachers said she has no problems in class and no children complain about her. However, they might not notice the condition outside the classroom.