My camey girl was smaller also and i have 3 whites that hatched with her, she is now the same size well some days anhow, they are still growing, will be a year old next month.
Girls fan also but i do have 4 IB males and three of them fanned all the time when they were wee babies and still do till this day and they turned out to be males and the other is a IB pied that hardle ever fanned and still doesn't do it to this day.
I have raised up 2 hatches over the last 2 years and i have never seen a female youngester fan all the time like the ones that turned out to be males did so i believe till they show me different here that fanning all the time is a sign of a male, i am getting some more babies this year so i will know more for sure cause 3 out of 3 times seeing this can't be wrong