Sounds like your mom needs psychiatric help this is far from normal behavior. Talk to your mom about boundaries and tell her she needs to back off and let you live your life and if she cant do that then she isn't going to be part of it. Sounds harsh to talk too your mother that way but her actions are way over the line and this needs too stop.
Good Luck.
Sorry, but your Mom sounds crazy, and it seems like your sister is treating her crazy behavior as normal. Go ahead with your wedding plans (you do know that you are the fiance, and she is the fiancee, right?), there's nothing else to be done. Your Mom is crazy irrational, and you can't reason her out of her craziness.
Sadly, I wouldn't count on her getting over it either. And as much as I hate to say it, her behavior is so far from normal, I wonder about her mental health.
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.