H.P.
my friend who is a pediatrician and a mom to twins did the following:
At 9 months she weaned her son from the bottle by slowly offering less and less formula by the week. She started with whatever number of ounces and reduced it by one ounce each week, and the final week was with water no formula. Her son soon realized that he was just waking up for water and stopped waking up and slept through the night.
You could try this--however, she did not wean from night time feedings until 9 months. Your baby is still 7 months and might just need the food still. You could try adding half an ounce here and there during the day or you could just try weaning and if there are some loud protests, then she maybe actually hungry.
However, if she's just drinking the amount you give her and not wanting more as you decrease the amount in her bottle--she's probably just drinking for comfort. We did this with our son, and that's how we knew he did not need night time feedings anymore. Good Luck!