Hi, Lori V., and welcome. Everyone is welcome to his or her own opinions. There isn't a breed that I know of that doesn't have a rescue group with dogs needing homes, really, and of course shelters are full of all sorts of dogs. Do you know of a Boston Terrier rescue group that you could recomend? Maybe that would give a dog a home with Sandy's mother, and she could talk to experienced individuals before making the commitment. Terriers of any sort tend to be higher-energy dogs than some breeds, but if she is aware of what she is getting for a dog, perhaps it will be fine!

Any dog can be a great dog for the right owner, with very few exceptions.