I don't know if this would work if some of the girls have dresses, but this time of year, they may all be in shorts.
I went to a birthday party with my 8 year old son at an indoor gym. They played a different game of tag that they seemed to enjoy. Several people were "it." They had a piece of foam that they threw at someone. If the person was hit, then they had to freeze. The only way to get unfroze was for someone else who hadn't been tagged to come and crawl through their legs.