What Can We Do To Stop a Meddling Coworker?

A question to Ask the Workplace Doctors about how to stop a coworker from meddling, interrupting and interfering in the work of others. 

Question:
I work in an office of around twenty people. One member of staff causes problems for the rest by constantly snooping and interfering. She eavesdrops on every conversation and feels the need to comment on matters that are no relation to her job or department. Every decision I or anyone else makes is questioned by her, despite the majority of matters having no effect on her.

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