Some babies need night-time feeds to meet their appetite, some suckle for comfort because they associate sucking with falling back to sleep.
For the last feed, does your baby suck on the bottle till she falls asleep?
If so, it could be associating milk/bottle with sleep.
To "correct" this, let her drink before sleep routine, preferably not from a bottle.
9 months old can start using open cup with handle.
Or feed with spoon from a bowl.
After that, sleep routine that can include a change, stories, songs, lights out.
When she fusses at night, feeding water from a bottle is still allowing her to suck for comfort to fall asleep.
Perhaps can try feeding from a normal water bottle, no bottle sippy teat.
Gradually, let her get used to falling back to sleep with some light patting or singing, massaging, etc.
It may take some time to completely wean off night feeds.
My boy was a fussy sleeper and breastfed for comfort every 1-2 hours at night, finally weaned off at 18 months old.
Likely because we transited from breastfeeding to cup feeding around that time.
At least we succeeded at 18 months old. I know a few 2 & 3-year olds who still wake up for milk at night.
All the best!