You could try giving her a feeding at 5:00-5:30, then 7:00-7:30, and moving your dream feed to 10:00. The 7:00 would be more like a cluster feeding. I know with my ds, as long as he went a leat 2 hours between feeds his tummy never got upset (but all babies are differen't). However, if she is sleeping, and can go the extra hour until 11:00, she'll probally be more hungry and take more at the dream feed and sleep longer through the night (if she isn't already). I remember doing something similar with ds and it was right around the time he starting sleeping until 4:30-5:30 for us.
Good luck!