My daughter had a friend from babyhood that became her best friend. They are 10 now and know each other very well. Same thing with a third friend they've played with since babyhood. My daughter has made a few friends (now in 5th) but I can definitely see what your daughter means by "I don't like the way the girls play."
Some girls are pushy and bossy.
Some girls just want to chase boys (I witnessed this in preschool.)
One girl in 1st grade completely tried to dominate my daughter. At one point she slapped my DD across the face.
So.... your daughter is basically saying "look, I just want to play."
She's probably apprehensive about standing up for herself to someone who is bossy. So it's easier to just play with a boy who isn't like that. A boy who just wants to dig in the sand and climb things.
If you would like her to make more female friends.... the best thing I ever did (by accident) was I made a girlfriend and our kids became friends. Since her kids are sane as are mine, they have played together for the past 10 years. I really love the way they all know each other and how far to go, how to recognize when the other is upset, how to step back, how to talk things out, etc...
So... get to know the other kids in the class and see if you can set up playdates. I wouldn't worry about this yet. Ask her what is going on with the other girls (what she doesn't like) and maybe you can role play (practice conflict resolution) for anything that might come up.