The theory regarding what happened to Michelle came up after a line in Season 5 was noted by BuzzFeed. There's a scene where Danny hugs his two daughters DJ and Stephanie, then hugs their best friend, Kimmy Gibbler, and proclaims her "one of his girls." It's a beautiful growth moment from the original series, where Danny would often lament Kimmy's constant presence in their home. Later, he says, "It's so nice to have three daughters again."
Again? What happened to Michelle? Furthering the theory, ScreenRant notes that all references to Michelle in the series, with the exception of the first one and a later comment about leaving her a voicemail, are in the past tense. It seems like, for one reason or another, the Tanner-Fuller family is suddenly acting like Michelle no longer exists, and it's caught many fans' attention.
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