That's very sad... I truly hope it was by accident and the owners didn't plan this, because that is just too sad...
Given her very young age, she is not old enough to be cleared for any health checks - including heart, hips, knees. maybe eyes, but i'm sure they didn't check anything. So you'd be taking a risk there by taking one of these pups. It's always better to get pups from a health checked parent. That said - they could be fine. Is Kayla's breeder responsible and does she do health clearances on her dogs before breeding? At least you have info on the maternal grandparents. What about the dad? Where is he from? the same breeder? If so, are the dogs closely related?
Is traveling to get a dog an option? What ever happened to the backyard Cav that your neighbor was looking to rehome?
Dogs are not our whole life, but they make our lives whole.