Hair loss

My 73 year old wife was diagnosed with Lewy Body Dementia three years ago and has recently been loosing her hair. I'm starting to see her scalp through what has always been a thick crop of hair. She takes no medications for the disease because of allergic reactions and lack of finding anything that seemed to improve her condition. She sometimes cries for what seems like no reason, and I know she is sad and stressed about her condition. Has anyone had a similar experience with hair loss?