In the clip below from 3:23 to 3:38, we can see that Mayuyu was still very affected by her transfer to Team A (and leaving Yukirin) and was wiping her tears behind Acchan.
And anyone noticed a MaYuki moment in this scene at the beginning of the shuffle announcement? I've boxed them so you can't miss them. It looks as if Yukirin was assuring Mayuyu about something (perhaps she's saying that no matter what happens, they will still be together
).