Not to sound negative or anything... but I'm a rabbit breeder and my thoughts would be she's misscarried, or had the babies and ate them. The small blob should have been the afterbirth so I think she has had them from those sounds of it... Hopefully this isn't the case though. These were my thoughts when I read your post, I also contacted a friend of mine who breeds rabbits and she also thought the same thing.

...Let us know what happens, we could be wrong though, lets hope.