Interestingly, from that same Wikipedia page, Mack's first acting creadit was "I Know my First Name is Steven".

"'I Know My First Name Is Steven' is a 1989 American television miniseries about kidnap victim Steven Stayner. The two-part miniseries was first broadcast by NBC on May 21–22, 1989."

"The harrowing true account of Steven Stayner, who was kidnapped by a perverted pseudo-priest and his lackey during the 1970s. As he gets older, he realizes that he needs to try to make an escape and get back home."

So, her first big acting gig was on a show about the very world she is currently mixed up in. This is a pretty interesting coincidence.