It’s a strong point of this show to watch the two of them going back and forward with each other and talking in their own unique way on the screen, and at the same time there have been some elements of rivalry between them, so there could be some truth to all that.
Of course, until either Cathy or Abby have made any comments on the situation, it’s probably safe to disregard those rumors. A show like that would always be subjected to lots of speculation and it’s important for fans to be able to filter out the important information from all the noise.
In any case, it’s not even certain of Cathy will be coming back at all, so discussions of this kind could be a bit of a moot point for her fans.
People are still actively watching her current progress though, and they seem to be expecting a lot from the future development of Vivi-Anne. We don’t know when we’re going to hear more details about that project and what the kid has been working on, but the sooner it’s revealed, the better – fans are very excited right now but they can only maintain this excitement for so long before they move on to something else if there is no development on this front.