C.K.
To finally make my son completely stop using a bottle I started telling him what a big boy he was. I made a point of saying it a lot throughout the day, especially when he used a cup. When he used a botte I said nothing.
I did that for about a week, then picked a day to be his last bottle day. When he woke up that morning I told him that was the last day he would get a bottle. He got his bottle at the normal times all day, but every time I gave it to him I reminded him it was the last day. That night after his bottle before bed I took him with me to the kitchen. While he watched I rinsed out the bottle and threw it in the trash.
The next morning he wanted a bottle, but stopped fussing when I said there were no more bottles and reminded him we had thrown them away. He settled for a cup and never asked for a bottle again.
I don't know if that would work for you or not, but maybe just talking to her since she's old enough to understand is worth trying. I think if you say there are no more bottles though, you cannot give in. You have to be willing to stick to it, even when she gets upset. If you think she isn't ready yet, then don't force her.
Good luck. I know it isn't easy to get kids to let of go of comfort things like bottles and pacifiers.