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That is sad. I had an early puberty, by the standards at the time - I was 8 and the average age was 13. I believe the age of puberty for girls has come down in the Western World, around 11 or 12 now.
Many of the bovine growth hormones and pesticides that are commonly used in the United States will cause precocious puberty and thelarche (premature breast development) because of their endocrine-disrupting chemicals. I wonder if her endocrine disorder was caused by an uncommonly high exposure to some sort of chemical...
Whatever the cause, how very sad. I hope she had some good theraputic help.