My Mom has been getting very confused in the evening's lately, I know its probably Sundowner's. Any suggestions?

She is fixated on where she lives, is this where we stay? How did we get all our stuff here including our purses? Do I just keep telling her the same answers over and over again?? Her dr. won't give her anything he just says that it is the dementia process, I feel like there should be something she could take to help her relax and quiet her mind down....