She lost herself in the world of make-believe.
Meaning: This means that she became so engrossed in the story that she forgot about the real world and pretended that she was actually part of the story.
Choice of Words: Lost means unable to find one's way or to find something. Herself is a reflexive pronoun referring to the subject of the sentence. Make-believe is pretending that something is real or true when it is not.
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