Anonymous Does that sentence say "Mary was looking around warily"? Yes, "about" is similar to "around" in this case. )
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AnonymousDoes that sentence say "Mary was looking around warily"?Yes, "about" is similar to "around" in this case. (Preposition sense 2a/2b at http://www.merriam-webster.com/dictionary/about : "in the immediate neighborhood of", "on or near the person of".)
Anonymousshe glances about her (or herself)You don't need the reflexive ('herself' in this case) in many cases where the pronoun object of a preposition serves as a reference location (rather than as an agent).