I have to point this out because no one else has yet: your baby is only 7 months old. At her age, "sleeping through the night" is about 6 hours, and compared to my experience and that of other moms (who don't lie haha), you are BLESSED to have a baby who sleeps as well as she does!!! :) She's waking in the middle of the night because she still needs that night feeding. It doesn't matter how much you feed her before she goes to bed; it's not going to make her sleep any longer (studies have shown this). I'm not sure how your other 2 girls slept, but my son still wakes in the night every once in a while at 2 1/2 years old, and that's perfectly normal. I've been praying since birth that he'd sleep through the night, but I was "blessed" with a bad sleeper.
Anyway, I think you should just go with the flow as long as she's actually drinking her whole bottle. Remember: you can't force a baby to eat, so yes, you can cut back on the amount in her bottle, but she's still going to be hungry, which is going to cause her to wake in the middle of the night. She'll grow out of her need for the night feed, but by then, maybe she'll wake in the night because she's teething or she had a bad dream :( Or maybe she'll sleep 11 hours and make everyone happy :)