E.-
We are going through this with our 14 month old as I write this to you. We are at the end of the process, but it has been a long road for us. I now nurse before bed and in the morning around 5:30 or 6:00. My son still has one wake-up around 2:30 am. Then he is out of bed at 7:30 am. I still haven't quite figured out how we are going to eliminate that 2:30 wake up.
I started by reading the "No Cry Sleep Solution for Toddlers and Preschoolers" by Elizabeth Pantley. She has some great ideas for getting toddlers to sleep through the night, specifically nursing toddlers.
We used a combination of her ideas and others that we had read about. We did each step for 7 nights. Four weeks ago I stopped nursing when he would wake up at night. This occurred 3 to 4 times a night. We held him while he wailed away. He would eventually fall asleep. Then we stopped picking him up when he awoke during the night. We comforted him in his crib until he fell asleep. This, for us was the most difficult period. I was ready to stop and just go back to nursing when he woke up. At least that way it only took 10 minutes for him to fall back to sleep! And there was no crying! Then I made sure that he was awake when I put him in his crib for the night. That was the key for us.
I've never felt right about the cry-it-out method. But I felt ok about it if we comforted him while he cried. This way he knew we were still there with him and he never felt scared because he was all alone.
I admit this was really a rough process for us. Some babies are just good sleepers, but ours definitely has not been. But we are on the road to a totally uninuterrupted night's sleep. I know it is right around the corner!
Good luck, and remember that each change you make will take some time for baby to get adjusted to. She has been in the habit of nursing to sleep for the last 16 months. You are going to be creating a new set of habits for her and she needs to become used to them.