Trying to get advise about getting to get legal rights of my friends medical decisions

My best friend of over 30 yrs is very sick.She needs a liver transplant. She has no family. She does have a husband. Her parents died left her a beautiful house and a large amount of money. The husband used to call me any time there was a medical emergency. Now he is keeping me out of the loop. Just talked to her after he finally gave her back her cell phone. Was wondering if there was any way I can be added to her emergency contacts and be informed of any medical decisions. I"m sure she would sign off on it.