It's not the Beltway that will be a problem. That should be okay. It's Rt. 95 in Northern Virginia that will be a problem - a big problem. On Saturday mornings in the summertime most of Washington heads south on Rt. 95 heading for the Virginia and North Carolina beaches (the rest head East to the Maryland and Delaware beaches) and Rt. 95 becomes a parking lot all the way to Richmond. If your friend can get out of bed early and be on the road by 5:00 am, she should get through there before things get too bad.