Waddo's wife is 1.59m high. That is 62.6 inches. The average height of adult females in the USA is 63.5 inches. Waddo's wife is about average height for an adult female in America.
https://www.cdc.gov/nchs/fastats/body-measurements.htm
Your child is that high? Unless you child is a teen who has already done their puberty growth, you might want to get them checked by your doctor for gigantism or other similar hormonal disease.
You don't seem to understand that:
You can't size a sloped top tube frame by looking at the "seat tube length".
You're not getting it. Bike sizes are referred to by nominal seat tube length, but they function by total size like a jacket or shoe.
That's why you dont go by leg length or reach (whatever that means), but rider body size.
And there is no reason that a 5'2" rider would go up in size from 15" to 17"