"When you return from your walk, toss her bumper a few yards, keeping the end of the check cord in hand. As she comes back, side step and do whatever you need to do to block her from running past you. Don't worry right now about her dropping the bumper, just getting her to come when called. If she insists on avoiding coming in give her a tug on the check cord. If needed you may need to pick her up by the scruff of her neck, lift her completely off the ground, make eye contact and tell her, 'Here'. Set her down and still holding the check cord, back up giving her short tugs on the check cord, say 'Here' and when she comes in, say 'Good Here' and praise her.