She can leave but will not be allowed to return with you. She will have to wait in her country while you file an I-130 which will take 12-18 months to process before she can reenter the US. However, as she was in the US illegally if you failed to apply for her green card, she faces a 3-10 year ban on returning depending how long she stayed She should NOT leave the US before she has her green card in hand.
File ASAP because if anyone finds out she doesn't have a green card, she is liable to be deported and banned from ever entering the US.
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.