Everybody starts puberty a little differently. Medication?! Wow, people suggests meds for everything. And growing up is a part of life. I hope you didn't medicate her for that. As a parent I would encourage your daughter to explore herself, and be proud of her image. Kids at school/everywhere are cruel enough. Make sure she knows what is happening, how her body will change in the upcoming years. Make it a good thing. A proud thing. She should be proud to be a girl/woman, and not embarrassed by it. And because she is changing on the early side of things is no reason to get frazzled. Girls especially are easily embarrassed by their image. Give her the tools and confidence to have a great self image. (I wish someone, my mom, would have done that for me.) If you are too uncomfortable talking to her about it, take her to her Pedi. They have good Dr.'s and Nurses that talk to kids all the time about growing up. Then at home remind her that she no matter what is a beautiful, smart, wonderful girl that you love reguardless of what others think. (I grew up with the notion that my peers had all the answers and when they said I was ugly or worthless I believed them. It still hasn't gotten out of my mind. I have a Husband who loves me, and thinks I am beautiful, but because of my poor self image I grew up knowing, I find his comments hard to take. I don't think anyone should feel bad about themselves.) If you can give her the ability to love herself as much as you love her, growing up won't be so hard.
Why would someone tell you to medicate your child? You are the one who is the parent. Your daughter may have ADHD, but that is controllable with out meds. All you have to do is stay on top of the symptoms- remember keep her focus, slow down, and schedules-don't change things up regularly. A constant schedule will keep her knowing what is expected next, and wich behavior is exceptable. Meds? Is she really that bad? Does she need to know that the only way she is "ok" is with Meds? Meds for growing up, really!
I hope you do what you think is right. Love the heck out of that little girl. Be proud of her with every step of her growing up, even when you'd really love to keep her little a while longer (forever).