“... there are girls in her class that wear bras”
Unfortunately, they may NEED to. My daughter is ten and several girls in her second, third and fourth grade classes were wearing either “training bras” or actual cup bras. Two of her friends started their menses by fourth grade. My motto is when they need them, they need to wear them. Otherwise, it is silly.
Two of her friends started their menses by fourth grade
They must be gifted and real smart