I wonder how much of this was the CW deciding to cancel the show, and how much of it was Melissa wanting to walk away. It can't be easy being the lead of a series and being a new mom, especially when her husband will probably be filming his new series in Los Angeles.
Hopefully, she can end up making a few guest appearances on Superman and Lois in the future. I just wish we could have had a Supergirl/Batwoman crossover with Melissa and Ruby.