On Supergirl Season 2 Episode 21, we got to see Cat mentor Supergirl, but we were denied a scene between Cat and Kara. It looks like that will be rectified, and Cat can offer her sage advice to her former assistant as well.
Cat: I need you to talk some sense into your friend, James Olsen. Clark: Jimmy? Cat: He's been parading around like Darth Vader, punching out villains, and I for one do not want to watch some space invaders slay him with their lifesaver. Clark: I think you mean light saber. Kara: Yeah, and Darth Vader actually punches out the good guys. Cat: Oh, okay, whatever. I've never seen Star Wars.