Well, she's probably not hungry because of her 4am feed, so if you want her to take that 7am feed again, what I would do is start to try and wean the 4am feed. Two ways to do that are either just offer an ounce less for a couple of days, then take off another ounce for a couple of days, etc. until it's gone. Theoretically, those ounces should be added to the 7am feed. Another way some moms do it, if their lo wants the liquid is to water it down one ounce at a time.
HTH