Need help with filing income tax while living in a different country.

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Here's my question My mother lives in canada, she has dual citizenship as a canadian and an american. She is planning on getting a job at a local grocery store there and but has no idea about filing for her income taxes in the U.S. She thinks that since she is still a U.S. Citizen she still has to file but dosn't know how she would do it. Is it still done the same way? Please help!