Your mom should call the vet. Any sudden change in behavior can have a medical cause.
If there is no medical cause, did something happen outside that scared the dog? If she was sufficiently traumatized outside, that would completely explain her current behavior. Your mom will have to desensitize and counter condition the dog to the outside and then rehousetrain. But I'd go to a vet first.
If there is no medical cause, did something happen outside that scared the dog? If she was sufficiently traumatized outside, that would completely explain her current behavior. Your mom will have to desensitize and counter condition the dog to the outside and then rehousetrain. But I'd go to a vet first.