Only 6' and 23lbs? That sounds a bit heavy to me. My biggest female BCI is 8.25' long and only 18lbs an she is a healthy weight.
What kind of scale did you weigh her on 3 times?
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I'm not 100% sure on the brand/model. Every few weeks I take a 20 LB weight, and weigh it to test accuracy, so I trust it. I do the same with my gram scale, but I use a 2 LB weight.