Is there treatment available for advanced dementia patient?

My wife was diagnosed with dementia approximately 8 years ago. We live at home with a trained caregiver and our two dogs.
She currently has restrictive body movement, mostly visible in the neck area, is unable to read or write, and her speech is limited, with difficulty verbalizing her complete thoughts. While she appears to understand discussions, she will ask questions. For instance, where is the bathroom? Her movements towards that location are very animated (giving her directions, turn right, etc.). She is very mobile, active, eats very well, and sleeps well with medication. Her mood is generally pleasant, with medication that dampens sun downers and evening "I want to go home" comments.
Her doctor says she is too advanced to use any of the new drugs to slow the dementia process. What or where can we go or do to at least try?