Some babies still need a feeding or two in the middle of the night at this age. To have dd go 8-9 hrs without a feed is great! If you really want to try to get rid of the 4 am feeding, maybe you should try the df again. Just make sure that it sometimes take about 1 or 2 week to see the result. At the same time you are doing this, you need to ready to soothe her back to sleep by either doing pat/shh, paci or wake to sleep. Keep us updated with your progress. Good luck.