Okay im a bit confused why she is angry since its a natural thing that happens maybe because you didn't tell her sooner about it and that she is a bit hurt because you didn't tell her this. But as for the lying part I really don't know why because its not something girls really want but maybe she was just upset try talking to her again and explaining why you didn't tell her :) good luck.
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.