A new post by Afton on Instagram (you can view the full post here) she names the 2 people that she was referring to.
"This season on The Rookie, I was sexually harassed by fellow actor Demetrius Grosse. I was Racially Bullied and Discriminated against and Sexually Assaulted by Hair Department Head Sally Nicole Ciganovich. "
Update: 4th August 2019 Afton Williamson recently posted this on social media about the reasons why she left the show.
As it was hinted in the season 2 press release for The Rookie, TVLine has confirmed that Afton Williamson will not be returning for the sophomore season of The Rookie. She played Talia Bishop, Nolan's (Nathan Fillion) T.O. It is not clear how the character will be written off.