Hi N.,
I have just a few ideas for you. I don't know what religion you are or if you even go to church, but what I would recommend is to check out some of the local churchs to see what they offer.
I know of one in particular for sure that offers a MOPS (Mothers of Preschoolers) program, although it is kinda NW Austin for you is Anderson Mill Baptist Church. MOPS is a mommie and me type of thing. I think most of them meet a few times a month and have playtime, crafts and other stuff. I think Central Baptist in Round Rock has one too. Also a lot of the Mother's Day out programs start their registration in the spring and have the schedule of the local school district so it would be out in May and starting in August. I taught at my church's Mother's Day out last year until I went back to work this year, but I live in Leander so I doubt you would want to drive that far!
Well, if you would like any other ideas I can try and help,but being in Leander I don't know a whole lot in your area.
J.