Wasn't easy for my husband in my 50s to learn to go out in public. Imagine it is even harder for a teen.
Oxygen has come up in some threads on the Adults forum
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In listening to people over the years it sounds to me like it is 1/2 bravado and 1/2 blending in.
For blending in, she might want to use the oxyview glasses <a target=_blank class=ftalternatingbarlinklarge href="http://www.oxyview.com/">http://www.oxyview.com/</a> .
For bravado, she might try the line a woman I know uses "I only wear it to inflate my boobs". (Of course, if she's as flat chested as I was at that age that just opens her up to a reply of "well, it's not working real well", but I bet she could come up with a good line for that one too.)
Hang in there.
As usual, acceptance by her peers really hangs on her self- acceptance. If she acts like it is no big deal, they probably will too. And since her attitude hangs on yours, you'll need your share of acceptance and bravado as well.
Good luck to you all.