My 4 year old baby girl really wants more friends :(

I feel bad because I work full time. Her dad doesn't really take her places to socialize with other children. When I take her out a lot of children are too young for her to interact with. Basically I'm looking for a momma or a few mommas with similar age group kids to meet up with. We can go to the indoor playground (on me). I just really want my baby girl to make a few more friends before kindergarten.