Suggest Treatment For Swelling In Ankles, Bloating, Dementia And Lack Of Appetite

Hi, My mother is currently dying, and is expected to return to my home for palliative care. I noticed her legs near the ankles are very swollen, has she begun to bloat. She is starving and suffers from dementia, she has no food or drink since November. How can I determine a life exepectancy?