I will probably be the lone duck here...but oh well. In my opinion kids wake up for a reason. I know many will say even at 6 months they don't neeed to wake up. However, sometimes they just need to check in with mom and dad. Particularly as they get older and that object permanence thing sets in. They KNOW mom and dad still exist even though they can't see them... and just want to make sure they are still around.
Also, GROWTH SPURTS! In my humble opinion, when babies are going through growth spurts they NEED extra food. Often times they are SOOOO busy during the day ... learning to crawl, learning to walk, exploring their environment they don't think about eating. How many times have YOU gotten caught up in a project and lunch just slipped you by. So, they wake up at night STARVING!
This past summer my daughter went through a growth spurt. She woke up 3-5 times a night and ate every time. It was exauhsting. When we went in for our 12 month check up I learned she grew 1.5 inches in TWO MONTHS! NO WONDER she was eating 'round the clock. She also ate non-stop during the day too.
It bothers me when I hear people say 'they don't NEED to eat or wake up in the night at such and usch an age'. How do you KNOW?! Can you feel what they feel? NO! It's just that we WANT them to sleep 12 straight hours by a certain age. We expect they have no needs during the night. We expect they won't get hot, they won't get cold, they won't get hungry, they won't get scared, we just expect them to sleep and leave us alone. Obviously I'm a believer in night parenting. It's just something to think about.
The other thing to consider is maybe your daughter has gotten into a habit of waking up. Try just offering some water or something at night instead of a bottle. If she really isn't hungry then after a few nights she won't wake up. We did do that with my daughter around 6 months to see if she really was hungry. I had my husband get up with her since I nurse her. We learned when she really was hungry and when she was not.
My point is just to be sure that your daughter really doesn't need anything instead of just assuming she doesn't. Since they can't tell us what they need... we have to play a bit of a guessing game. I know how you feel... my daughter still wakes up as well. But there is always something.... full wet diaper (I hate the idea of letting her just lay in pee all night, I certainly wouldn't want to do that) or in need of food. It is tiring... but at the same time I know I am meeting her needs. There will be enough time to sleep when she is grown up and has moved out.
Good luck.