B.N.
I took my son off the bottle at 24 months and i have to tell you that the longer you wait the tougher it is. It was a long 2 weeks but well worth it. I took him to the store and let him pick out a few cups that he wanted. Seemed to allow him to feel that he was in control over part of what was going on. If your daughter goes for a few days or even a few weeks without milk while she adjusts she will be fine. For the first week after the bottle was gone my son refused to drink milk but after he realized that the bottle was NOT coming back he gave in and now asks for milk all the time in a cup.