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"While it was happening, of course, she was caught up in it, but once it faded and she came into herself again, all she knew was terror."

"Came into herself" seems to mean something physical, like "wake up". Am I wrong?
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MeggPhaggSioux"Came into herself" seems to mean something physical, like "wake up". Am I wrong?
It depends on the context. In your quote it seems to mean something other than the physical. Is seems she was engrossed in some activity that required or demanded her full attention. After things quieted down and she could take some time to notice what had happened she was terrified.

By the way, even though I see nothing wrong with the highlighted expression, you will probably more often hear "came to herself"
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Emotion: zip it
 MalRey's reply was promoted to an answer.