She joins a cast that includes Allison Williams and Violet McGraw.
James Wan, Jason Blum and Williams are producers on the hit films follow-up.
Johnstone and Mark Katchur are executive producers.
Ivanna SakhnoAxelle/Bauer-Griffin/FilmMagic
Michael Clear and Judson Scott of Wans Atomic Monster banner will executive produce.
Blumhouses Ryan Turek is an EP.
Adam Hendricks and Greg Gilreath from Divide/Conquer also are executive producers.
Sakhno is repped by represented by Gersh, United Agents, MJ Management, Sloane Offer Weber Dern.
