There's a lot of developmental stuff going around her age. Talking, mobility, awareness... you name it. I'm sure something's gotta do with it.
If she's OK chatting in her crib, leave her be. As long as she doesn't need your intervention, she'll eventually go to sleep if she's tired. If she skips the nap, go with an early bedtime to help her catch up on lost sleep.
HTH and that she grows out of it soon!!!!