What can I do to bring some pleasure to my mom who has Alzheimer's?

What can I do to bring some pleasure to my mom living at her home with Alzheimer's? We talk everyday (way too many phone calls!) and I visit her at least every other day. We do simple outings such as her favorite hairdresser and small diner style restaurants. She's no longer interested in shopping at all. She's also not interested in photos of happy memories or the grand/great grandkids. We visit my dad at his assisted living apartment. He has very fragile health issues and mom wants to be with him but a restraining order will not allow that to happen. She had no hobbies or passionate interests her entire life. My dad directed and guided everything she did. She is just so angry, sad, lonely, self-pitying, and always wants to fight with me. I remain patient and search for something to make her smile or laugh again.