Where I disagree with Cannongerbil's:
We already know why they were in Ishinomaki (the healing circuit). Asking seems pointless.
No, we're not "letting that one go". Not going to pretend to tolerate that action.
Not starting off friendly then adding intimidation. Start off at drill sergeant, and tighten the screws from there.
Bits that I would pull from gerbil's:
Hold off on grief cleansing until we've started to get some answers.
Ask about what grudge the Ishinomaki girls have against the Sendai girls, rather than the generic "Why are there so many magical girls coming into this fight?"
Other:
Focus on groups and motivations rather than leaders and personalities.
Revised various bits:
[x] Restrain upsetness, but make it clear we're not tolerating independent action. Retrieve Akiko and fall back to a more secure position.
[x] Be paranoid for a few kilometers. If anything pings your senses, get ready for a fight but do not engage pre-emptively, and focus on trying to outrun if possible.
[x] Try to find an empty place to hole up, preferably in a relatively out of the way location.
[x] No grief cleansing til we've gotten some answers.
[x] Questions:
-[x] First of all, DAMMIT SAKURA. We were trying for the diplomatic solution and you've cocked that right the FUCK up.
-[x] Second, what the hell is going on. Why are there so many magical girls coming into this fight, and why was that group after you?
-[x] Who else is involved? (Merely confirmation of what we already know, but gives us an excuse to reference them in further questions.)
-[x] Tell us everything you know about these other groups (Tohoku, mainly). Their leaders, capabilities, dispositions, and motivations.
-[x] Finally, what is Sendai's stake in all this bullshit? It's a giant clusterfuck, it doesn't seem like their style to get involved in this sort of thing.
I don't like this. Sakura'll answer by blaming us for causing a ruckus with our display of witchyness.
I think the point is to set the tone, and express our current feelings on the subject of her behavior. How she reacts is secondary. And if she's blaming us for giving them a chance to escape, well....