Hi there-
Our son is 20 months and we are in a very similar situation. He still takes one bottle at night-not to go to bed anymore, but still before bed. It's part of his 'wind down' and now he actually asks for his 'ga-gool". For a long time it was AT bedtime, but we just pushed the bottle up each night and as he got older his bedtime got later. Now he has it about 30 minutes sometimes an hour prior to bed. I figure this is the first step towards getting rid of it.
I was hoping to cut the bottle out about 5 months ago, but then we decided it was his only 'vice' and that we'd lean into it-it's only once a day. It's true though - everyone said it would get harder as they get older and he is definately more attached now-and it would have been hard before.
So-my first advice to you is to either decide to be ok with it and wait it out..I firmly believe that when he's a little older and has understands better we'll wean him from it-but for now it would just be a screaming match. OR, do it now. It might be hard at first, but it will probably be short lived.
I would suggest starting by giving her the bottle a little earlier each night-not just at bedtime. I've also had people say that starting to water down the bottle helps too. It's hard cuz at her age reasoning is certainly not an option!
Not sure if this helps, but hope so.