Very simple. 1) ask yourself if you can live without her in your life. A) if the answer is yes, walk away now.
B) if the answer is no, then you will put her past out of your mind and realize what the other guys do or don't remember shouldn't matter to you. You can't have it both ways. This is your ego talking to you.
What the other guys had was sex. What you are getting is love. If that isn't enough for you, do her a favor and walk away.
By growing up, and realizing that her past has no relevance except what you yourself bring to it. This is your insecurity talking, and while it's very commonplace it's not particularly healthy. You say she's not that person anymore?
Then believe it, move the hell on from that topic, and act like a mature, secure, adult.
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.