I wonder if the city can force your mom to get it cleaned or it will be demolished? I wonder if that is a big enough threat for her and I also wonder if she doesn't comply she would be forced to go live in a home? I wonder how much she needs to be scared before she realizes all her freedoms are gone?
I think you are doing an awesome job looking after your mom and your husband should realize that also. And taking her to a place where there is a lot of people I don't think is a good idea.
Anyways keep doing what you are doing and you will come out the winner...