I agree with the above post. What if you did 3 Sunday's at one parish and even 1 at your old parish.
I do believe it is important for children to have Orthodox peers to relate with. My sister and I were the only Orthodox kids in elementary and middle school. In high school their was one Coptic Orthodox girl in my class. She and I bonded immediately!
It's good for kids to know there are others "like" them and they are not the only ones who celebrate Pascha (and in my case Christmas) on different days than most others.
Besides, I have found that the friends and life you make in church is what stays with you. I have forgotten most of my school friends. We've all moved apart and lost contact with each other. However, the friends I made growing up in church, and the memories from our church school are still with me. I am blessed to still attend the same church, and still see those "kids" I grew up with, coming with their own kids to church. This is what has remained solid in my life.
So, yes, I think it would be good to make sure your daughter grows up in an Orthodox community filled with kids and activities appropriate for her.
However, as was said, she's still young, and you have time.
You might even check with the Antiochian church for courses/activities offered beyond Sunday school. I know that my 2 local Antiochian parishes are also very active and have many, many children. They always are offering evening activities, classes and summer schools.