Recent rumors claimed that Rose did not enjoy relocating to Vancouver for the production, and that she did not adjust well to the long hours that it took takes to make Arrowverse episodes week in and week out.
This reportedly led to a not-exactly-mutual split, and Rose’s words definitely make it seem like there were more issues at play.
After all, the next part of her post is the most oblique, with Ruby Rose saying that her decision to bounce from Batwoman was a difficult one to make, and indicating that only certain people are fully aware of the situation.