sorry about your jill ,postmortems dont come cheap either .I had a litter a few years back i borrowed a friends little hob ,kits were really healthy ,they were nearly 6 months old when 1 died nearly 2 weeks later another and almost 2 weeks after that the 3rd one died ,i had a postmortem done the results came back negative to any obvious signs why they died, at least it has put your mind at rest for the reason why your jill died.