most medications are dosed on weight so regardless of her age she may be prescribed adult doses assuming the are safe and recommended for children of her age (many haven ot been tested on children). when in doubt check with her medical provider or the pharmacist.
my granddaughter is 10 weighs 125 lbs. and is 5'7' should she take adult or children dosages of medications. too hi a dose with having a liver that is only 10 yr old