I think that the swollen feet are a direct function of her walking about as much as all day long possibly. because she is in the middle stages of Alzheimer's she is likely not easy to keep down or to get to stay still for any length of time in order to elevate her feet. it doesn't sound as if she has a primary congestive heart problem or kidney failure from the way you're describing things. She simply walks over abundantly and does not take the time off to get her feet up. there are specific medications for Alzheimer's disease (non-tremendously affective I might add) but all the same you may check with your doctor to see if any of them may be of some benefit to her in terms of getting her to be a little more settled so that she can take appropriate breaks and help the swelling of the feet down.