Why do people think Ch.3 would dump Matt for a newbie or anybody? Except for Yaya, and maybe Kim, Ch.3 promotes her as much as their other top girls in that generation. She's never been excluded from any of their major events or promotions. Matt is right there alongside the rest of them. She too is the favored daughter of a production (Maker J), like some of the others.
And again except for Nadech/Yaya, Mark/Kim, her "koojin" with Grate is promoted by Ch3 as much as James/Bella, Margie/Boy, Pope/Mew etc. Now maybe it seems like her koojin isn't as popular with the fans as some others but that's not from lack of Ch3 promotion. There's not a single Ch3 sponsored koojin event that all the others got to do and Matt didn't. Just look at the concert, her part is equal to everyone else's. The fact that she is part of the core group that had the biggest part at the concert IS from favored status. Lets be honest, it's certainly not from singing or dancing ability that earned them the right to be headliners. None of the top people can sing or dance all that well except for Yaya who is a natural performer.
If K'Nong wants her in here and the schedules work out, Matt will get the role. There's no reason to think Ch3 would dump her. If Matt isn't in here, then something somewhere went wrong or it just didn't work out.
