Do you do a dream feed? What does the rest of your day look like timing wise? My ds nursed twice a night at that age too. It's not particularly fun, but he did eventually drop the feeds of his own accord. I found that if weaning the feed was that much work, it wasn't time for it to go yet. And if she's just 6 months, there is a growth spurt in there too that could be messing with her feeds.