A.R.
I weaned my son at around 11 months. Hopefully your DD takes a bottle already. I started mixing breastmilk with formula (half and half, then smaller amounts over a few days) and feeding my DS out of the bottle for most of the feedings. The night feeding was the worse one to get rid of because my son usually fell asleep while nursing. Eventually I worked it down to just all bottles with formula and he forgot all about the boob. When he turned a year, I started mixing formula with whole milk and then he was weaned completely off a bottle and taking warm milk from a sippy cup.
*Make sure to invest in some tylenol and warm compresses for drying up your milk. My boobs were rock hard and hurt extremely bad for a week. That was the worse part about quitting breastfeeding. They got so full of milk that I was soaking thru nursing pads in a half hour and once I took my bra off milk would squirt about ten feet. Hopefully yours goes better than mine did. Good Luck !