These are very interesting animals. The mother was removed before delivery, and has not been introduced to ANY other adults? If that is the case, my thought is this. IF the enclosure you put her in was smaller, her body may have only produced half the litter. Then when you weaned that litter, it may have finished. I definitely notice that when I dont wean properly that litters are smaller. They regulate themselves to what they percieve the conditions for survival are.
Your situation I have not seen. You should keep your colonies together. They need the social interaction, and will actually help rear each others young. The first litter can become a victim of this practice, as anything that scares them can create a massacre. But in the long run your production will be better that way.
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