It may be time for another round of "Cry It Out" that may last for a while. Kids sleeping cycles just like their rate of growth! She must be going through a phase where she is waking and not able to soothe herself. Make sure she has something to "snuggle" in her bed/crib.
I know it sounds harsh, but don't give her the feedback she's looking for and it may die-out faster. If she wakes up in the middle of the night, don't go to her bedside. Stand by the door and whisper, we're here go back to sleep and then leave. If she comes to your room, turn her around.
She's figured out that if she cries all night, one of you will eventually go to her. We learned this lesson with my son too! At 2, we had to go through the "CIO" again and it took a solid three nights of letting him cry and be upset before we were back on track.
I know that a lot of people don't like the CIO method, but it does work.