I didn't say Sage will force an apology from Chad, but it's a transition that needs to happen, I'm sure it will.
Sage humiliated herself by going to ask Chad for the truth, he ran away again, it can't be considered a closed chapter. i'm convinced of it, but of course i can't prove it or even repeat it from now to chapter 9 (assuming it happens there)
in the seventh chapter, Sage takes care of the problem of the sisters who renounced to become HOTs, and after having given the task to Quinn, she takes Maya's story in her own hands. Maya is definitely a more improtant character than Mona, but I was sure that at some point she was going to take care of her too. the dialogue between Camilla and Riona, about Mona not answering the phone, wasn't enough to close the matter,
in fact, in the eighth chapter, Sage speaks about it directly, Mona is also a problem she wants to solve. then she may or may not be able to do it (I think Mona will come back in the story), but the fact that Sage had to take care of it personally, I was sure it would happen, it couldn't be left to the backstage, to what happens and we don't see it.