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The biography I'm reading now says that Marie Antoinette was "a marionette, whose strings were mainly pulled by her powerful mother."

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In my opinion you must remove the last comma.

CJ

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The biography I'm reading now says that Marie Antoinette was "a marionette, whose strings were mainly pulled by her powerful mother."

If you are giving a direct quotation, give it exactly as it was originally written. Don't start correcting what you think are errors made by the original writer. So, include the comma.

Clive