She's nearly 16, and in 10th grade.

She's an honor student, all her electives are college level, and she's also taking AP history (the only AP class offered at her grade level).

But my kid is more modest than I ever was at her age. When most of her peers are wearing skirts and low-cut tank tops, she's shunning it all… It's almost like she's not my daughter.
She won't wear skirts. Claims she's “too tall” at 5'9. I'm her height and I wore skirts at her age.

I don't understand. And she's so self-conscious about her chest. I had the same size (or maybe bigger, I'm not sure, she tries to hide hers a lot), and heck, in the 80s I FLAUNTED it. I liked the attention it got me, I liked knowing that people thought I was beautiful.

She tries to make herself hideous… Just yesterday, she told me this summer she wants to wear a swim shirt and trunk instead of a normal girl bathing suit. I won't stop her, but why?

What did I do to my tiny girl? Everything else she's amazingly liberal; she's dyed her hair some shocking colors, jewelry insane, but she won't show a single square inch of skin.

Answer:
Nothing is wrong with her, that's just the way she is. Remember even though she's your daughter, she isn't you, so you can't anticipate her to be the exact same way you were at her age. Don't worry about it or pressure her about it, just let her be who she is and be grateful that she isn't running around showing a ton of skin at 16. I'm in my 20's and I don't like showing a ton of skin either, I wear skirts and feminine clothes that flatter my body, but I'm not someone who's running around in a mini skirt while showing ton of cleavage, it just isn't me.
Make sure your daughter knows she’s beautiful but don't try to turn her into someone she isn't and make her feel like something is wrong with her when there isn't.
Answer:
Lady, let her be who she wants. She has the ability to express herself her own way, and forcing her to show her boobs off isn't right. You might have been a preppy girl but maybe she’s into other things. Leave her alone.
somthing is wrong with YOU for thinking somthing is wrong with HER.
Answer:
most moms would me grateful of that.
Answer:
Just Let Her Be Her.
why would you want her to flaunt her boobs? are you sure your a mom?
Answer:
maybe she's a lezbean. If not, just be glad your daughter isn't a whore. She just needs time to learn how to appreciate her body.