for girls, site such as
dressupgames.com, nick.com ,Disney.com, toontown.com stardoll.com idressup.com , addictinggames.com
thanks

My boys (6 4) like disney.com, nickjr.com and noggin.com. One of them (I think it’s Disney) has a cool game where you start your own business and try to make it profitable. My kids are a little too young to get it completely, but they still enjoy it. It might be better for a little bit older age group.

On-line chess would be good for that age too. My 6-year old just learned to play and he enjoys it and picked it up very quickly.