Did I break my baby?!

My angel is 10 months old and has actually been an amazing sleeper. We have gotten her on a great schedule and she has always been able to put herself to sleep.

But now it’s like a switch went off in her brain and she will NOT GO TO SLEEP without being rocked! If we lay her down like normal, following our routine to a T, she will scream bloody murder. For over an hour. Yes, I’ve let her try to cry it out because we have exhausted everything else. She doesn’t have a fever, she’s not hungry, she’s not wet/dirty, she plays like crazy before bed, she isn’t grabbing at her mouth or ears like she’s in pain, we can’t figure it out.

I am desperate for advice or any insight to anyone else’s experience with this. We just want her to get enough sleep like before!