For a 10-year-old to have an "hourglass figure and fully developed breasts" (which would correspond to Tanner Stage 4 or 5, typically seen in mid-to-late adolescence), her hormonal profile would be profoundly abnormal for her age. This condition is known as Precocious Puberty.
Her hormonal profile would look more like that of a 14-16-year-old girl:
Estradiol: Levels would be significantly elevated, likely in the range of 20 to 75+ pg/mL or even higher. This sustained, high level of estrogen would be the direct driver of her breast development and the redistribution of body fat to her hips and thighs, creating the hourglass figure.
FSH and LH: These would no longer be just nocturnal pulses. They would be elevated into the pubertal range throughout the day, consistently stimulating the ovaries. A GnRH stimulation test would show a robust, adult-like response.
Progesterone: If her puberty were advanced enough to include ovulatory cycles, progesterone levels would also rise in the second half of her cycle.
Growth Hormone and IGF-1: These would be at peak levels, causing a rapid growth spurt. However, the high estrogen would also be accelerating the closure of her growth plates (epiphyses), meaning she would have a shortened growth period and end up shorter than her genetic potential as an adult.
Other Androgens: Levels of adrenal androgens like DHEA-S would also be significantly elevated for her age, contributing to pubic and axillary (underarm) hair growth.