Mighty Morphin Power Rangers: Once & Always' Pink Ranger absence has been further explained by original star Amy Jo Johnson. The television special is an upcoming 30th anniversary celebration that will feature several original cast members including David Yost, Walter Jones, Steve Cardenas, Johnny Yong Bosch reuniting to fight villain Rita Repulsa after the death of Trini the Yellow Ranger. However, two cast members will not be appearing are the late Jason David Frank and Johnson, who previously stated that "I never said no…I just didn’t say yes to what was offered."
https://screenrant.com/power-rangers-once-always-movie-amy-jo-johnson-response/