Please help me rectify the sentence，tks.
There's only one in the world that if I don't contact her within one week, she will call me proactively, it's my mom.

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Please correct my sentence, thank you.

There is only one person in the world who will call me herself if I don't contact her for a week, and that person is my mom.

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"There is only one person in the world whom I must contact each week, or she will call me repeatedly. That person is my mom."