My girlfriend and I have a male and a female potbelly. We were told the female was fixed, so we weren't worried. Well, she had babies. There were 9 born and 4 were dead on arrival. She crushed two by laying on them and then actually crushed one with her mouth in front of us and killed it. There are a boy and girl left in good health. She is mean to them and rarely lets them feed off her. They are 7 days old and already eating off the ground. What do I do to prevent her from hurting these two?