She had a cyst/tumor in her reproductive tract! She tried and failed with 3 litters over the summer/fall - one live kit that I fostered over to another doe... all the rest that she tried having were DOA - and all 3 litters had at least one large, stretched kit. The weather finally let up today so I processed 10 rabbits in total - 2 older does, then 8 grow outs. I meant to have my camera with me because I had a hunch there would be something note worthy with her. I haven't done a huge amount of processing anyway, especially with adults, but I knew the marble size (maybe a touch bigger) mass shouldn't have been there. It was vascular, so I am guessing tumor? I actually anticipated seeing a calcified kit or two, but other than the cyst/tumor thing I think things looked fairly normal (a whole lotta fat though! blech!).