any advice getting back to our old sleep schedule?

my 6 month old daughter used to sleep 10:30-7 every night and would get up once to feed around 3. it was absolutely perfect for me. then she went on a sleep strike and woke up one day at 2am and would not sleep until 9am. we finally got through that but her new schedule seems to be 9:30-6 wth no middle of the night feeding and I'm having trouble adjusting. she's currently taking her long evening nap (usually has a 3-4 hour nap before waking up to feed and bedtime routine) and it's currently 10pm and I'm creeping around like a mouse trying to keep her sleeping a little longer in hopes of getting back to our old wake up time. we EP and she takes 4.5oz bottles during the day ave before bed I usually give 5oz. in hopes of a later wake up time.. anyone experience this and have any tips? or should I just suck it up and try to alter my own sleep (and pumping) schedule to better suit her?