Since you don't know the history, I'm assuming this might be the reason her previous owner didn't keep her- age or other factors that negatively affected her reproduction. Not every animal (or human, for that matter) reproduce successfully- sorry this didn't work out better. Were the babies undersized? Any visible defects? (I'm assuming they had no injuries from the mom?) Was the rat fed well? What about handling &/or stress? Fighting with other rats? (kept alone? or with others?)
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