94 Year Old Cat Hoarder

Don't know what to do. Mother is cat hoarder. 94 years old and can barely take care of herself. She has at least 15 cats indoors. The neighbors shot the ones that were outside - at least 12 at the time. We cleaned her house 3 years ago and I ended up almost dying from pneumonia. We found out recently that my husband, who has been ill for the last three years since the 'cleaning' (Dr. thought it was Chronic Fatigue Syndrome) found out last week that he has been suffering from a bacterial infection (Cat Scratch Fever). Her house is getting worse and worse now - filthy with feces, and she still allows her females to breed - we try to take the kittens to the shelter before they become ill - some are not so lucky. She is stubborn, and very angry when we bring up a solution to the problem. Her solution is to make us feel guilty. She will not let us help her in a constructive sane way, and she has a very bad heart. Any intervention I know would cause her to have a heart attack. I don't believe I could live with that - it is hard enough to know that she is living the way she is by choice - and there is nothing we can do about it. What a nightmare.