If I were the one who directed this reunion movie and the actor/actress who portrayed one of the characters didn't show up, I would have looked for another person to act as that character. So Nancy Mckeon didn't want to reprise her old role of Jo, you all could have found another actress to play as Jo. Actresses like Sandra Bullock, Anjelina Jolie, Tiffany Thiessen, or even Neve Campbell all look similar to Jo and could have played as Jo. Who needs Nancy McKeon to play today's version of Jo anyway. If you look at the noses of Jo and how Nancy McKeon's nose looks today, there would be a big difference. Jo's nose looked rather pudgy and round, while Ms. McKeon today has a roman arch type nose. So Nancy McKeon probably would not fit the part of Jo very well today. She just does not look like how Jo would probably look like today. Think about it. Other well known actresses could have, and would probably have been willing to play the part of Jo, but they (the producers) wanted Nancy McKeon to play the part right when she refused.