If she has taken f/t, she'll take it again. You just need to be patient with her. It's a good idea to make them wait a little longer for their food for the first few f/t feedings to make sure they're hungry (like going from a 7 day cycle to a 9 day cycle until they've eaten f/t several times). Also, if she doesn't eat a meal, wait at least until the next regularly scheduled mealtime, or you can end up stressing her out so she doesn't want to eat -- I made that mistake myself before.