Andrew,
That's a great story. I'm sure it will be a lasting memory for her. I've participated in several funerals at Arlington and it brings a tear every time I go out there.
I would say she could take a tour of the White House, but it might not be open
If you are able to make it out here, you could make it to the "Nationals", just go a couple miles north and you could take in a Washington Nationals game
r/
Frank