Oh no, I do hope your mom is doing well, it is so heartbreaking! How is mama Cadence doing? Bless her, and the pups. XXoos
While taking temps, could it have been possible she missed "the surge"? I have been told by several breeders that you must take it every 3-4 hours, because they could go back up in temperature within a couple of hours, and you could potentially miss the surge. The surge also means they will go into labor within the next 48 hours.
Hope little echo makes it. I bet they are beautiful
(((HUGS FOR YOU, MOM2Bullies, CADENCE and HER PUPS)))