The details are important here. Given that most mothers don't have time to go to the range frequently, her training will limit her to a revolver (what are the immediate actions for a jammed revolver?). Bear in mind that she also has to handle scared children, a phone, and a weapon at the same time. I agree with you that she should step up to a Barnes bullet, since a wheel-gun will feed anything, or she should step up to a .357magnum. However, we can never get away from the fact that training and motivation defeats fear anytime.