You have to forbid the aunt from doing this, she could kill your daughter! Don't you realise how serious this is? Of course it is illegal, she is assaulting your daughter a lot of sedatives are very dangerous to children, they have been known to kill adults!
There is always an option if you are keeping your child safe, no more visits to grandmother, perhaps your grand mother can make her see sense,or is she agreeing with the abuse of your daughter? You should call child protection and the police,but you know what they will say, she should not visit such a place! Get a grip, your daughter relies on you to protect her,or do you want to get a phone call from your grandmother saying that your daughter won't wake up!
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.