The little one is now 23 days old. We have started to expose her to the other pups. See the videos. We are also conditioning the other moms to them seeing each other with no dividers between their whelping area. Soon, in the next day or two this one will come out of her whelping box.
We have already tried her on the pad but it is foreign to her still. They get this from conditioning. Each time they wake up, you put them on till they are heading to the pad themselves.