Yes it can happen -- a bitch can crush/suffocate a puppy. I use a pig rail in a 4' square box. Also, I do not use blankets or sheets, because a pup can get up under them or in the folds and smother. I use newspapers, at least for the first couple of weeks. They sell a box for about $120 on e-bay, easy to put together, wood, has the pig rail, and they can ship it quickly. I have two of them, because after about two weeks, 1 box gets to be crowded. And, it is easier to move the pups from one box into the other, and put the door way up while you clean the one box. Then you move them to the other side and clean that, then your remove the door panel and they have both areas.
I wouldn't give her bully sticks or bones. Both can contain salmonella and it is an unnecessary risk to the baby puppies. Also, she is too concerned about them, that she is neglecting her puppies? I would just stop them. If you want to give her a treat, give her white ice cream.
Heidi Ho, Odie
Joy-Joy, Bear Cub, Hepsi-Pepsi
Cujo2, Karma Chameleon
Ramona the Pest, Kojak -- who loves you baby?
Tiny Tinnie, Susie's Uzzi, Kaiah -- The Baby Monster.