omg, the poor puppy ... The new owners need to be careful to not let this ever happen again. I am very sorry one of your babies got so sick . It is commont that a new pup won't eat after going to a new home, but, waiting to get the pup into a vet is never a wise choice. The new owners seem to not have a lot of knowledge about yorkie's or to deal with low blood sugar.
I am glad she is going to be ok, and feel bad that they blamed you.