I know how hard that is, we made the same decision for a cocker spaniel a friend found on the freeway when I was younger. He was a very loving dog, but he also bit with little or no provocation and we had two small children in the home.

I am very glad that you and your mom are ok. Don't feel bad, you are making the right decision. Hopefully she will find the right home with the means to help her overcome this issue.