Our son has the same problem, which began while an infant. He also developed pubic hairs, actually curly pubic hair. The hair has since fallen out but he still gets body order. He has possible Precocious Puberty, this might be something you would want to get your daughter tested for. Our son his and always has been off the scales on the high end for his growth, he is 2 years old now and is the size of most 4-5 year olds. Just a thought.
This Forum is designed to tackle issues of child behavior, not so much general pediatric medical concerns. So, I cannot respond to you in a helpful way. However, many peole read the Forum and someone might weigh in on your question.