answer:Tell your mom that it’s not worth the risk, and the dog must be crated 100% of the time if the toddler is there. Otherwise, she’ll have to come to your place to visit (sans dog). Resource guarding (toys, food, or favored people) is a natural canine behavior and while behavior modification and training can help to control or redirect it, the safety of a child is too important to risk (remind your mom that a serious bite would likely result in the euthanasia of the dog, so she’s protecting her pet as well as the child).