Identifying foods is something that most babies find fascinating. Take advantage of this by making a game of identifying fruits and vegetables using the flash cards.
You can use all the fruit and vegetable flash cards together and make a game out of doing the signs. Introducing your baby to these foods before feeding them to her seems to help reduce pickiness. It seems like if a baby has been introduced to the sign and the flash card before being asked to eat the food, they find it familiar and are more likely to give it a try.