You will definitely want to join Vienna Moms. It's a wonderful resource for play dates and just about anything else!

http://www.viennamoms.org

I'm sure a bunch of the preschools in Vienna still have space - kids are always joining thru the school year.

Try to get her on a list for one of the pre-schools. There are a bunch in the area that offer a few day/week, morning only, etc. options.

Look into joining Vienna Moms. They have organized playgroups.

We are moving to the area from out of state right after Christmas 2016. Our older daughter is 3.5 (4 in March), and I'm worried she will be lonely. Anyone have a playgroup going in the area out a daughter of similar age and open to playdates? We will be in temporary housing by Dunn Loring metro until we find a house but are committed to finding a home in Vienna. I know at this age parents getting along is key so we are both professional, late thirties liberal- leaning laid back sorts moving up from Atlanta. Our younger daughter is almost 2 in case anyone has kids of both ages. Thanks!