BMI is read differently for children. According to pediatrics.about.com 92 for an active 10yr old girl of her height is a healthy weight. She is put into the 82nd percentile. Anything above the 95th percentile is overweight and anything between the 85th and 95th percentile has the risk of becoming overweight.
I wonder if the Wii Fit takes children's weights in to consideration during calculation? Also was the system built specifically for the Asian ethnicity. Other non-Asians have a different build and often a much higher bone density. Does Wii Fit take this into account?
This is surprising because Nintendo is so worried about offending people. I would have thought that for anyone under the age of 18 that Wii Fit would not judge if they were overweight or not.