"Raised in a rotting mansion by an evil witch. Unorthodox child-rearing techniques."
"...Oh. Um, anyway Ms. Halliwell might do for convincing my mum it's okay but Sally's parents would be better."
Before she can say much of anything, a male voice says, "Yes, you can take our daughter to France," and hangs up.
Sally winces. "Sorry. They're v- really busy."
"It was my mum who needed to hear that, but, uh, maybe she'll believe me."
"I can corroborate, if you like. And Sally, who can't lie without medical assistance."
"Lead on, MacDuff. My geography's kind of spotty outside five hundred acres of briar in Yorkshire."
"I beg your pardon?" says a woman who looks just like an older less braided version of Miranda.
"I got my first wand from Mr. Ollivander but he wouldn't sell me a second one and Ari and Sally were there and decided not to get wands from him at all. I got a second one from a secondhand shop though and it likes me fine. And they're getting their wands in France because he speaks French and Sally's dad says it's okay."
"He does! He wouldn't really care if we were going to, like, Burma or somewhere, even, but France isn't even an issue. Might want us to get wands before going to Burma, they've got basilisks." Catching a meaningful look from Sally, he clarifies, "Not many, though. And there's certainly none in France. Temperate region, you know. Speaking of which: France?"
"Hrm," says Miranda's mum. "Just briefly? How are you getting there?"
"Quite briefly! Wands, possibly getting lunch or ice cream or jewelry or something, right back. Via Floo, both ways. I can Apparate but I'm not allowed, because of laws."
"...Well, all right, but I need to know more about where you're going than 'France'," says Miranda's mum.
Ms. Halliwell, in the background, chokes on her flask.
"As do others," Ari allows.
"A very classically-trained wandmaker, but one who's not afraid to break tradition for a good reason. Like getting a spare wand, or, uh... that sort of thing."
"Oh. Hogwarts professor. Recent hire. Transfiguration, since Professor McGonagall's busy carrying the world on her back. Helping Miss Martin get her bearings in the wizarding world, and helping Mister Smith get his bearings in the... world."
"Nope!" Ari says cheerfully.
She sighs and explains the procedure. Halfway through, Ari nods decisively and dashes past her to the fireplace. Before she can react, he dashes some powder into the flames and ducks in.
Sally makes an upset noise. Ms. Halliwell lets out a strangled growl and turns to Miranda. "That... I need to follow him and make sure he didn't land in Atlantis somehow. Would you help miss Martin through the Floo to our actual destination?"
"The chimneys are destination-locked, just say 'Marseilles' and step through."
"Okay." Miranda turns to Sally. "Have you ever done this before at all?"