This with Sarada reminded me, made me think. Asha'rah and Meagan went Off Camera after the talk with Iris. I got the jist of it, but not so much the details. Still, I have a feeling that whatever was discussed explains wjhy Meagan hasn't jumped into the fight, in a manner of speaking. At least more so than just her Guardian duties. Meagan is basically picking up where Iris left off, though that's all I have right now.
Cyanna has been in regular communication with Eva, a magical Pen Pal situation, as she completed her high school education and graduated. Eva woudl also have helped her with her magic where Etrina left off.
Cyanna and Meagan would both have heard about what's going on, but for reasons were unable to leave Chroma.