M.M.
I weaned my third daughter at age two because she was like a hummingbird. She would come up, pull up my shirt, take a sip and take off. It would go on all day! Needless to say, that was not convenient and it was a bit silly. So I came up with a plan: Every time she would come up for a drink, I would hand her a drink in a sippy cup. It only took about three days, and she was weaned.
If I were you, I would give up daytime feedings first because it will be easier to distract her by playing and whatever. I would wait a week to tackle the nighttime. Nighttime feedings are going to be hard, good luck! With a lot of cuddling, though and patience for a few days, the nighttime feedings can be stopped too.