I know people who do the colony thing and it works for them. I think the difference comes when they get caged in together. As others said, it does sound like a normal first litter. I had a doe that kindled a month ago and didn't feed her babies, then left them uncovered in the freezing cold. They all died before I even got the chance to notice. I would just eliminate all the possible upsetting things for her-I'll bet next time she'll do just fine!