Kay Alden might be against undoing Jill and Lauren as half-sisters. Remember: when she was at ABCD, as a consultant for AMC, she resisted undoing Josh Madden as the Unabortion, because she felt doing so would have required an even bigger suspension of disbelief than the one it took to make him the child Erica supposedly had aborted. Ergo, given that Jill's origins have undergone two major retcons already, she probably would advise SSM to leave that story alone.
"The formula of soap operas makes it really hard for an African-American to get any traction. There’s always a family that’s central to the story on a soap opera, and if the show loves you, you will turn into the long-lost brother or you will get married, which is easy to do for a white character. But as an ethnic person, they bring you on to be smart. You get to be the lawyer or the doctor for the family. No one sees where you live, they never bring you home. There might be one episode in February where they talk about your family because it’s Black History Month. Your character might be on once every three weeks. You walk into a room and you say something really smart and noble, and then you walk out. And you only make money when they write for your character. You couldn’t win the game as a person of color, no matter how talented or beautiful you were."