The original event occurred in '98, the year when Rowena Erickson founded Tapestry. I lived in Cache County then, next to Box Elder County, and Mary Ann's beating was the talk of the town (among Gentiles and those fallen away, that is.)
https://www.culteducation.com/group/1099-polygamist-groups/16566-judge-dismisses-suit-against-kingston-beating-victim.html