As a survivor of two parents being in nursing homes and having worked in the elder care industry for over 22 years, I would like to offer some, I hope, wisdom!
Have you discussed the issue of moving to a care facility with her physician? If he feels that she needs to be in an assisted living or nursing facility, having him/her tell her this may carry more weight. Older people tend to accept the authority of their doctors more than ours!
Some ways that you could proceed:
Does she live with you? If so, and she continues to be opposed and you really feel that you cannot care for her, you and your husband can tell her that she can no longer live with you, period. She will flip out, but just be silent and let her run her course. Then say that you are sorry that she feels that way, but the fact remains that she can't stay with you because you cannot provide the care that she needs, and the MD agrees! In other words, call her bluff. You have a duty to do what is best for her AND for you. Put the decision of where to move into her hands, but give her a deadline.
Make sure she knows that you are serious and firm in this decision, and do NOT even attempt this if you are not going to hold fast to the decision. Any sign of wavering and you will be lost!
If she lives alone or with you, you can wait until she has a medical crisis and ends up in the hospital again (with the medical issues she has, this is probably going to happen sooner than later) and then not take her home, but have her go to a skilled nursing home or assisted living facility from the hospital. And then be firm about her staying there, for the same reasons as above. She will still be upset, but you have the new hospital stay as validation of your position.
Keep repeating to her that you are not abandoning her, but you are doing what is best and safest for her because you love her. Set up a reasonable visiting schedule and stick with it. If you can't make a visit for some reason, set a 'make up' date and come then. Make sure the staff knows what is happening, so they can back you up. Don't take her word for how things are going, but ask the staff, especially the activity coordinator; elders like to lay a 'guilt trip' on us by painting a bleak picture. They think this will guilt us into taking them home!
Also, it doesn't hurt to keep a visitors journal in her room so you can record your visits (and others) and show her that you have been attentive. I am sure that she is afraid of being abandoned, helpless, and alone, and that is understandable.
I wish you every good luck! Michael A. Bower, ACC, Life Enrichment Consultant