She sighed, closing book, returning to reality.
Meaning: This sentence is describing how the girl finished reading the book and came back to the real world.
Choice of Words: Sighed means to make a long, deep breath, often as an expression of relief or sadness. Closing means to shut or move something so that it covers an opening. Returning means to go or come back to a place or person. Reality means the state of things as they actually exist, rather than as they may appear or be imagined. So, "She sighed, closing book, returning to reality" means that the girl sighed, closed the book, and came back to the real world.
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Related Expressions