From my understanding
critics of sleep training methods involving infant distress do argue that these methods can indeed cause chronic stress as the baby has learnt not to signal when struggling during the night.
We tried a variety
of sleep training methods which would all sort of work & then she would start waking up earlier & earlier, like 1 - 3 hrs after falling asleep & only fall back asleep in our bed.
Take care to lay her in her crib before she is totally asleep and use one
of the sleep training methods to teach how to coax herself to sleep.