How do you deal with an overly intruding person? One who's not even your friend!

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She is such an intruder! She sees everybody's moves, watches out for what everybody will wear, and criticizes them for it, and she reports evrything she sees and hears to the boss! How can I deal with such a peson. she's a lot older than most of us, so we feel it is impolite to just talk to her up front, plus we believe she will strongly take it against us! I've been seriously thinking of resigning from my present job just so i could get rid of her from my life!