My kids live IN DC. Same here. If they can get to PG County and then make their way West, they can get to Hagerstown.
I supplied them with military water packs and MRE's, emergency kits with solar blankets, flashlight etc. Light and mobile. What they don't have is guns. But, this would be a martial law situation and everything that goes bang would be deadly to the owner.
Did you get your daughter a kit?
Based on the prevailing winds I think I'd head directly to Beckley.
Interesting. No, I have not supplied her with anything, but the wheels are turning now in my head.