First off, how are you certain that she's gravid? Were you able to record Tail Wraps, Ovulation, or Post Ovulation Shed? Also, although Dumerils sometimes mate year round, they're usually only fertile just after the end of winter. Your estimate would put the breeding in the beginning of fall. At 6 months pregnant, she should look like she's ready to pop. While some boas eat while pregnant, it's very uncommon.
If you could provide some additional details and pictures, maybe we can all figure out what's going on.
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Paul D
