It's not too soon.. The recommendation is to give milk in a cup and drop the bottles at 12 months (although many do continue with a bottle beyond this age).
We ditched the BT bottle by 12 months and the morning bottle by 13 months (he was more resistant to this one and I needed him to take a decent amount so went slower with the change). I gave him a straw to drink from in the morning rather than a sippy cup. This way he took just as much as with a bottle but we could get rid of the bottles and teats (and stop sterilizing). Maybe try that if you are worried about her milk intake?
The main reasons for ditching bottles is to protect teeth so if you practice good teeth hygiene (no juice in bottles, not on the bottle all day but just for the few mins it takes to feed, brush teeth after BT milk etc) then there would be no harm in keeping the bottles for longer.
