I agree with most of what has been said. If bottlefeeding her to sleep feels OK to you, why change it? Just one caution - don't leave the bottle in her mouth half the night, you don't want to make her into a candidate for bottle-mouth caries (you know, where all their front teeth fall out because of sleeping with milk or juice pooled behind them) As I understand it, all you need to do is sneak the bottle out once she has definitely finished drinking.

Re controlled crying, it was originally designed for use on 18 month olds, and now the child mental health people are suggesting that you really shouldn't do it until 3 years if possible! So if you do decide that you really want to wean her from the sleepy bottle, you might like to consider other options such as substituting a comfort object, some music etc. rather than going cold turkey. She's still pretty young to be expected to put herself to sleep completely independently.