Jeremy,
Very sorry to hear about the cape. That is a really a bad deal for you and the animal. Unfortunately it does happen and it seems that when it does it is always an animal you are really proud of and cherish.
Interesting enough a good friend in Europe contacted me the other day about a similar situation. He has been working with pits for a number of years and had a cape of his that egg bound. She was a 6 year old proven breeder that had never had a problem before( 2 previous clutches). She laid 4 eggs and had three more inside her. She died in much the same manner as you described.
He attributes the egg binding to having kept the female at too warm a tempeture after breeding ( approx. 8-10 degrees higher, because of a bad A/C unit). I am not sure I agree with him, but it is his position that the female's tempeture was elevated during the last several weeks of carrying the eggs and it caused them to begin development and become too large to pass for her size. In quick passing this could make some sense, but then again I am going to have to re-think it for a while before I buy into it.
I do know though that I have had corns that laid huge eggs and in some cases had laying problems and then the eggs were short hatching clutches IE less than normal by several weeks.
Not sure that this has any correlation, but it is indeed something to think about.
Again sorry to hear about the loss,
John Cherry
Cherryville Farms