All I can say is Im terribly sorry and I dont want to imagine losing any of my furbabies and even worse witnessing their death. The only advice I can honestly give is to make sure that your furbaby wears a harness everytime she goes outside to potty. My husband doesnt seem to mind to let Cookie our 4 yr old ,walk outside with him to the driveway without a harness! This is something that I DONT allow and I flipped out when I saw him just run out after my husband. It is a pain to have to put a harness or collar everytime on him but I keep imagining that something like this can happen to anyone.So I put a collar on him or a harness.
There is no other puppy that can replace your little girl but it may ease your comfort in the days ahead.
These little furballs STEAL your heart immediately.
Genie
Cookie
Lola
Angel
Lucky