Don't worry about it much. Kids wean off the bottle at different rates. My son wasn't completely off bottles (he had trouble letting go of one before bed) until he was over two. I started him on the cup when he was around 6-7 months old by giving him a cup of water with meals. That really seemed to get him comfortable with the cup in a nonthreatening way; he was just very attached to the bottle.
If you're worried about getting her using the cup, I would start with milk or water--whichever one she seems to prefer--with meals so she gets used to having it around and she can practice. I like the Gerber Soft Starter Spill Proof Cup (I found them at Target); they're really durable and soft for little ones just learning.
Separately, you can work on getting her off the bottle. Depending on what your routines are, you might try putting less in the bottle or watering it down. I've also heard of putting something like water in the bottle and milk or a preferred drink in the cup and offering both so that the cup starts to look more appealing. But I'd get her comfortable with the cup before I really started to worry about getting her off the bottle.
Good luck, and remember all kids wean at different rates. And remind yourself she won't be taking a bottle to college!