I will be honest in that I felt bad to have shot her given the fact that there is no way of finding the den due to a massive badger earth just above where she was shot...but alas I dont shoot them this time of year unless I need to so not much I can do.
With regard to the question when I first saw her I though she hadnt cubbed as she had a massive belly on her until I got closer and turned the torch on...she must have had a bloody good feed recently. I reckon you are spot on unless she had just decided to starve them for a day or so.