Congratulations relax, you are over thinking this she will as nervous as you are before you go on the trip, do your homework, about the white house, have some interesting facts to impart if you feel conversation is lacking don't let nerves spoil your trip, you should be looking forward to this, not worrying.
I cant really gove you an answer,but what I can give you is a way to a solution, that is you have to find the anglde that you relate to or peaks your interest. A good paper is one that people get drawn into because it reaches them ln some way.As for me WW11 to me, I think of the holocaust and the effect it had on the survivors, their families and those who stood by and did nothing until it was too late.