J.O.
Have you ruled out teething and ear's? It could even be another one of those charming growth spurts. My son who is 20 months, goes to sleep on his own ( no CIO) and usually has a good night routine, started to do the same thing at about the same age, and then a month later he was back to his same routine, I did cut back his nap to only an hour though, but last month it started up again, and it seemed to get worse, I thought it was just teething cause he would point to his mouth and say Boo-boo, but still he wasn't getting better, not really worse just no real improvement, into about week 2/3 not sure, I said enough the night before had been real bad, turned out that on top of the teething he had double ear infections and one had been a while, poor guy you would think with as many kids as I have I would of caught it but all my kids combined had only 5 ear infections and other then struggling with bed time he had seemed pretty good. If those are ruled out then she is most likely in a phase that will just require a little patience, I would her down like normal wait a few minutes and if she is still inconsolable go into her and see if something else will work. Someone I am sure would have a better suggestion....good luck!