I'm concerned about my 83 year old mother-in-law. I noticed that her feet are swollen, are purple, and she has sores on the tips of most of her toes. She is not always up front and honest about her health and medical concerns, but she tells us she is diabetic and that her doctor tells her it is under control, and she needs no medication for it. Because of her age and fear of going into a nursing home, she resents anyone who questions her about her health, and wants everyone to "mind their own business". We understand that at some point we may need to step in and give some support that she may not appreciate, but just don't know if this is one of those times. What cold be going on with her feet?