Hmmm...
Does she wake at the same time everynight? If so, it could be more of a habit than hunger.
Does she take a full feed when she wakes in the night?
When she wakes, do you go right in or give her a few minutes to resettle?
Have you tried using the pacifier vs feeding her? YOu may try that.
Also, I didn't BF for very long, so this could be a long shot - maybe for the breast feeds during the day she isn't getting as much as she used to, thus waking in the night to make up the calories? Otherwise 6.5oz sounds great for her age.....
Just some random thoughts of mine.....