Most breast-feed infants do not like infant formula and need it mixed with
breast milk to accept it. If the bottle of infant formula tastes
like breast milk she will accept the bottle more. Try mixing ¾ breast milk and ¼ infant formula at first. If she does accept it, then after a week or so, try doing a bottle mix of ½ breast milk, and ½ formula. If you wish, you can gradually go to a bottle mix of ¼ breast milk and ¾ formulas, then totally to all formula depending on how she accepts it.