I'm sorry for your loss, but I kind of figured this was what had happened. In almost 30 years of breeding rabbits, I have only seen does actually having contractions a few times, and it was usually when there was a problem. When you said you'd seen that she had been spotting blood but had produced nothing, I suspected she was pushing against a fetal giant. I don't think I've seen more than one or two of those survive. I suspect that the process of delivering one of those huge babies takes too long.
