Originally Posted by Ariana:
When she cries, let her cry a bit longer each time, then pick her up. Repeat. Its a long process but she will eventually stay asleep.
I'd do everything she said, except for the rocking.
Graduated extinction. Go now as you intend to go forward.
Lay her in her crib, awake. Comfort her verbally first, pat then hold for a minute while standing. Lay her back down, walk away. Wait longer and longer to comfort. If she is still awake after 20 minutes, let her go back to the floor with toys. Repeat.