I'm no "expert" but I am a Mom of 2 kids, and each had different personalities.
To me... I think she is going through or already HAD a "growth-spurt" but her intake has NOT increased, per her growth. Thus, she is waking a lot because she is hungry. And the pacifier at night just ain't doing it.
Next, how long has she been drinking "6 ounces"???? Perhaps, she is able to now take in more? Have you tried that? She is now older, bigger, and her appetite seems hearty. How come you wanted to give her "smaller more frequent" feedings as she's gotten older? USUALLY, their intake amounts INCREASES... and if not, they are always hungry. BOTH my kids had GINORMOUS appetites, and at 5 months old, they were drinking more than 6 ounces per sitting. AND, when a baby has growth spurts, they also often need to "cluster feed."
Anyway, just my observation.
I think, your baby is just hungry and needs more intake, and perhaps more often.
AND, perhaps even during the night, instead of just getting the pacifier. At this age, they still need to be fed on demand. My kids were "big" too for their age... and gee, they had a big appetite at all hours of the day and night. It was a biological thing, especially when they were hitting growth spurts and developmental changes.