Opinions Needed, Quick

Syd and I checked out a Mom’s Day Out program today and she thought it was pretty cool. So we are enrolling her to start this Monday or Tuesday. She will go once a week for four hours with a total of 5 kids in her class with two teachers. They have LOTS of playtime mixed in with crafts, storytime, stroller rides, outdoor playtime, snacks and more playtime. Here is my dilema. Syd has music class on Tuesdays, which she loves, she has been with the same kids all year and enjoys seeing them each week. So, I was going to enroll her in the Monday Moms Day Out class. But, today I found out that the Monday class consists of all boys, Syd would be the only girl. The Tuesday class has two girls and one boy. Do you think its important for her to have other little girls to play with in her class, or does it not matter at this age? I could move her to another music class so she has girls in her MDO class, but then she would not be with those same kids anymore that she enjoys seeing each week. The MDO teachers say that the little boys in the Monday class are all really sweet and not rough with each other at all, so they think its no problem. And the kids at this age don’t tend to really play together much anyway. Also, the little girl in the Tuesday class actually pushed Syd over during our visit because she didn’t want her to share in craft time. The boy could care less what Syd did, never bothered her. She does seem to want to play with boys more now at the playgrounds since the girls tend to be more bossy, but she loves watching the girls play so she can copy them.
What should I do? Move music class so she has girls in MDO. Or leave her in the same music class and see how she does being the only girl? Both classes, music and MDO, end in the end of May so is it even long enough to worry about anyway?