Tell her that if she doesn't stop you'll Report her for shop lifting(go with her and secretly tape her with your phone or something of her do it) and if she doesn't stop take the tapes to the police. She most likely won't get arrested but will get a hefty fine. She should stop then cuz then she knows that if it keeps happening you'll keep getting her fined.
It's wrong for her to do that and YOU need to stop her. It's your private business not her pieres. Hope I helped.
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.