J.P.
Hi S.,
Try diluting the milk with water. (75% milk and 25% water)If she notices to the point where she is upset... don't add quite so much water... otherwise keep it... how I said.
Do this for a week or two and then add a bit more water and less milk. Then, again after a week or so, increase the amount of water. Soon it will flip flop... more water and less milk until.... the bottle is all water. And once it is all water... try a sippy cup instead of the bottle. I used this method with my twins and it worked! And the water can stay there all night and she can just wake up and take a sip and hopefully go right back to sleep.
Good luck, J.