Despite not attending her sisters' wedding, Fuller House included a sweet Michelle tribute in its final season that many missed. Alternately played Mary-Kate and Ashley Olsen in Full House, the youngest Tanner daughter was the only core cast member from the original show who didn't return for the Netflix sequel show. There were some conflicting reports leading up to its release and even during its earlier years that she may show up, but in the end, the Olsen twins stuck with their initial stance on the matter of skipping Fuller House.
https://screenrant.com/fuller-house-final-season-michelle-tribute-explained/