NC for this, as identifying. I have a bodily characteristic that clearly sets me apart from others, and isn't considered a positive thing. People refer to me by it ('the girl with [characteristic]), I was given cruel nicknames, and when I was younger, complete strangers in the street even regularly approached me to suggest I have surgery for it. It is funny. Some people hardly notice it, for others it is all they can see.
It can be operated on, but as with all procedures, it entails risk and no guarantee of a desired outcome. I looked into it when I was around your daughter's age, but decided against operating for the potential risks involved, and as there was no medical need to have anything done (it is purely cosmetic).
It wasn't easy, but I eventually gained a confidence that was not based in the slightest on what others (and men in particular) thought of my looks. Things have turned out well. I have been together for years now with a wonderful (and handsome) man. I do lots of public speaking and even the odd tv appearance. It hasn't held me back in the slightest.
I doubt your daughter receives as much derision for her breasts as I did at that age for my characteristic. But in case she feels that way, I hope she can learn to see her breasts the way I see my characteristic: as a good compass to get rid of superficial men and women who don't value her for all that she truly is. What I long saw as a punishment, turned out over the years to be a blessing in disguise.
In hindsight, I am so happy I did not let myself be pressured by external expectations into an operation that would change something fundamental about me. This doesn't mean she should not consider a boob job ever. I just hope she learns to embrace her breasts first, and see herself as the complete and valuable person she is, and not just judge herself by her cup-size. She can then take a considered decision out of a position of strength, instead of one of insecurity.