What should my friend do about her ill father getting neglected by his money-hungry wife?

I have a friend who has a father that lives in another state (about a 3 hour ride). The father has dementia, diabetes and a host of other physical problems. He is married and owns a condo. He is growing increasingly frail and demented. His wife had moved out and gotten her own apartment, after it was found that she had stolen from him. My friend (the daughter) was going to have him move in with her but when the wife found out she decided to take him back. She admitted she was having trouble financially on her own, but the father loved her and missed her. He moved into her apartment, and he now rents out his condo to the wife’s granddaughter.

He recently entered the hospital, due to a fall. The wife called my friend and informed her, which was very nice of her to do, as she and my friend have not been talking. It was discovered that he has not been receiving his insulin shots, and he is in poor physical health. The doctors said he had not been receiving his insulin shots for months. The wife is supposed to administer the shots and whatever his medical needs are at home. The wife is also the power of attorney.

My friend is upset that her father has been getting neglected by the wife. The wife has no interest in keeping the husband alive, as she is due to inherit his money, condo, etc. if he passes away. The wife has been buying him alcohol and probably not making him follow a diabetic diet, because she never has in the past (she always cooked the richest, most fattening foods). My friend cannot afford to take him to live with her, as she cannot afford it without some money, and the wife has power of attorney. Furthermore, my friend has an apartment with many steps, and the father could not handle the steps.

if she makes too much of a fuss, or calls the authorities, the wife may not keep her informed in the future as to the father’s health condition. He could die and the wife may not even call her if she wanted to be spiteful. She hates to see her father neglected, but her hands are tied.

what would you do if you were in my friend’s situation?