A major aspect of Harley Quinn Season 4 has been Poison Ivy's new journey. She's been struggling to balance her personal and professional lives. In this case, Ivy is trying to make the relationship work with Harley, but things are complicated given Harley is trying to be a hero with the Bat-family. Throw in Lex Luthor being toxic, and Ivy is up to her limit with the Legion of Doom.
Source：https://www.cbr.com/harley-quinn-poison-ivy-season-4/
