Embittered about the things Anakin had took from her, which includes her life, the Republic and her never being able to hold her twins thanks to his actions, Padme starts haunting Vader. She blames him for everything that went wrong and him bringing the end of her beloved Republic and him killing her for for the most pettiest reason.

Bonus points if Vader starts thinking himself as 'mad' when he sees Padme eveywhere. Extra points if Padme breaking stuff of the Death Star and sabatoging Vader's thing, which causes him to get in trouble with Sidious.