Im 12 N have an A bra size... Give her. Small bra and tissues xD I dont stuff my bra but many people in my school do
Like I said, if nipples poke out she needs a training bra of sorts. That's just not kosher. Tell her to ask her mom to take her to kohls. Nice and cheap, but good quality.
And eww, never stuff. If you really get self-conscious, get a small bra with padding. That's infinitely better than stuffing.
My god this girl she wears thongs on gym days and stuffs her bra so much. Friday was apparently "National Butt Smacking Day" for her. Her locker is like 2 down from mine and I have to see her get her but slapped all day