C.W.
I agree with the other moms about letting her pick out a cup that she likes. Also, if you exclusively give the cup you'll see that she transitions after a few days. I'm not saying that they might not be very trying days, but then it will be done. With my daughter I took away the bottle gradually until there was just a bottle at night. Then to drop that one we did a cup and snuggled like one of the other mom's suggested. But then they just get to a point where they don't really need that before bed milk anymore and it kind of resolves itself.