Well, I'm not a single woman, but hopefully I can somewhat help answer your question.
Ashburn is, what I would consider, a growing area that would be very nice to settle down, start a family, and raise your children. There are some restaurants and bars scattered around the area, adding a few things to do, but you will mostly find communities of homes.
If you are looking for an active area with lots to do, as well as an area full of other singles, I would recommend the Arlington or DC area. It is truly a great area to meet others, socialize, and always have something to do on a weekend night.
Hope this helps!