How much does she weigh in total?
Unless she is huge, she should be eating a small rat every two weeks. Not anything weekly.
If she is huge - depending on weight and body condition, a medium rat every 2-3 weeks is as big and often as I would feed.
Also, do you weigh after waste or at random times. Best to weigh "dry." However, if feeding weekly, there's always going to be something in there.
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