What's the Last Day for a Plan Mb to Cancel New Plan?

Ex: Nervous Nelly Plan A member Enrolled into plan B for Jan 1, 2017. Nelly changes/loses her mind and wants to remain on Plan A. I'm under the impression that she has until Dec 31 to cancel Plan B. No need to re-enroll with Plan since she is ALREADY on Plan A and Plan B hasn't started yet. She frantically read a letter to me that mentioned Dec 7 though.
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