One theory suggests that Michelle died in the Full House finale due to head trauma, and the rest of the series revolved around the Tanners coping with their loss.The absence of Mary-Kate and Ashley Olsen from Fuller House was logical, as they have left acting behind and are focused on their successful fashion careers.

Fuller House floated the idea that Michelle is already dead, but the youngest Tanner daughter may have never had the chance to grow up at all, as she could've actually died in the original Full House finale.
Played alternately by Mary-Kate and Ashley Olsen, Michelle Tanner was one of the fan-favorite characters from the late '80s/early '90s family sitcom. So, many were understandably disappointed when she didn't show up in Fuller House.Refusing to recast Michelle, Fuller House was forced to come up with an excuse to explain her absence. Since the Full House franchise put a lot of emphasis on the importance of family, the sequel had to find a justifiable excuse for Michelle not coming back home while all of this was happening.
The producer mined inspiration from the Olsen Twins' real-life job, revealing that their sitcom character is now based in New York where she runs her fashion empire.
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