That sucks and sorry to hear that you lost your female like that and under those circumstances. From the description of the litter and of your female, it almost sounds like gestational diabetes. I'm no expert by a long shot but from your description of the mom (large body size {obese?}) and also the description of the babies (larger than average size for pups, small number in litter, etc.); both of the above could also be signs of it having been her first litter, as those can sometimes be fewer in number...but that doesn't answer the larger-than-usual pup size.
It could also have been that she was too old to have been bred, especially if it was her first pregnancy. Female rats pelvis' don't fuse but it can be dangerous to breed them when they're older, as it can lead to complications. Not pointing blame at you, as you didn't know her age as you said, just saying that it can lead to issues. Not to be too graphic but if indeed it was a breech birth and she was straining, that could explain the amount of blood in the enclosure. Smaller capillary vessels and blood-rich areas of the body could have ruptured from her straining and being unable to deliver the stuck baby. Regardless, sorry for your loss and best of luck to you.
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