You are forgetting a crucial point. In this version the family got to know Yuri before she made a home visit. It might very well be that, depending on the outcome of the class observation, Mom or even Sakura invites her to have a talk.
All of you thinking Yuri will be devastated when Sou says he wants to be alone. Could be, but that's not actually the only option here. Remember how Yuri reacted... "with that guy?". She's still partly in denial and her bratty attitude might actually help her. Another key factor is that her splits actually stabilize her mental state. They made her stunlock the family by giving advice on how to behave and present herself. As a result, not only was Yuri not bullied - she shocked the three to the core and got away with it.
So it could also be that Yuri gets her part done pretty well while actually Miku is the one screwing up this time. Looks like she's one step short of actually losing her temper. She might explode or overreact and someone else has to clean up (probably Kana or Hinata). Hinata's comment is quite foreshadowing.
As for Yuri and future developments. Don't forget, She made a pact with her splits - and becoming Sou's escort student is one of the goals Tenshi and Succhi want her to reach. I agree, it's likely she might make a mess, but kissa cooked up much weirder stuff already. I mean, in the end kissa has to find a way to make the class observation a success, that is to say make the family allow Sou to continue going there. Let's be honest, right now the class is doomed and we need something major to balance things out.