K.T.
I had a problem with my son sleeping in his crib beginning around 10 months old. He just all of a sudden refused and would cry until he was so upset I was afraid he was makinghimself sick. I tried all the tricks of staying with him, etc, but nothing worked. After trying everything I could think of, I finally took him out of his crib. He now sleeps on a twin mattress on the floor. I have a accordian gate that goes around the bed to keep him in and safe, just like a crib, but he likes having more room, and I really think he hated the bars of the crib. He also hated the feeling of being put in the crib...that dropping feeling woke him up every time if he was asleep, and just being in the crib made him cry when I put him down awake. The mattress on the floor is working wonderfully. He has plenty of room to move around while he is sleeping and he doesn't feel caged in.....even with the gate.
Some babies just hate cribs. The trick is to try other options until you find what works for her.
Good Luck!