Aha!
This pine wand (phoenix feather core) likes her just fine. Sparks! Miranda pays seven Galleons for it and sticks it in her hair.
"Excuse me," she says, when Ollivander turns away.
"Mm?"
"May I have a look at some more wands?"
"Something wrong with the one you've got, Miss Swan?"
"No, sir, but please, I want a second one, in case this one gets lost or damaged."
"Planning on that, are you?"
"No one plans to lose things, I just -"
"Planning to mistreat the wand? Leave it lying around? Forget about it someplace, carelessly handle it -?"
An unreasonably happy teenager pokes his head through the doorframe, followed by the rest of himself, followed by a girl with the wide-eyed look of an eleven-year-old Muggleborn in Diagon Alley, two parentals, and a harried-looking old witch.
"This is where wands happen! Or so I'm told."
"Hello," Ollivander says to the newcomers, principally focused on the eleven-year-old for obvious reasons.
"She needs a wand. I also need a wand, I've been working with antiques. Are they particularly singular?" Ari asks Miranda curiously. "I've got spares. Could wash the blood off, even."
Ollivander sighs and takes measurements from the new kids and starts summoning heaps of boxed wands for them to try.
Ari cooperates with the autonomous tape measure, though an inadvertent tickle results in undignified and highly dangerous flailing. "Spare? Huh. I like that idea. Nimue knows I'm probably going to break at least one."
Sally nods. "I- also, also want, a spare. I like- safety."
"Nobody spends seven Galleons on a wand planning to break it," says Miranda, "but it's the most important possession we're going to have and that means if something did happen it would be very bad and it would be good to have a spare instead of having to owl-order a new one without a chance to test it."
"Miss Swan, most wizards go their entire lives with a single wand," says Ollivander. "What were your names?" he adds to the newcomers.
"I'm Sally," manages Sally.
"To be fair, sir, I have broken a lot of my most important possessions. Like priceless artifacts. And my skull. And priceless skull artifacts."
"That doesn't make any business sense," complains Miranda. "If it's profitable to sell one each at seven -"
"That is final," says Ollivander, and Miranda grits her teeth.
The harried witch puts her face in her hands.
"My wands are the finest -"
"I'm not criticizing your wand quality. I tried to buy two here!"
Ollivander sniffs. "There are some secondhand shops which may have something." He writes down an address for her.
"...We can teleport, you know. There's three entirely distinct ways to teleport. And France would be better than a secondhand shop anyway, secondhand wands are kind of crap."
"If that will be all the purchases today," says Ollivander, "perhaps you could conduct this conversation outside of my shop."
Ari and company exit. "Miss Halliwell knows where to Floo, I speak French, and there's a bunch of grown-ups here. Or we could bring your mum along."
"Mum's busy moving in to the new apartment or she would have come with me to go shopping," says Miranda. "I'm going to at least try the secondhand shop, but if I don't find anything and you're still going to go to France I can ask her if I can come along."
"Sure! We'll be getting familiars at Eeylop's."
"Weren't we going to get stationery?" attempts Ms. Halliwell.
"Yes," agrees Ari. "We'll be getting familiars."
The professor makes a small noise of despair.
"Oh, I want to get an owl too, but I think I'd better try for a second wand first in case it winds up doing something unexpected to my budget. Maybe I'll run into you there."
Some time later, he may be found making faces at a cat in the pet shop. The apparent parents are not present, but Sally is looking intensely at kneazles, and Ms. Halliwell is having a drink by the toads.
Miranda comes in with two wands crisscrossed in her hair. "Hi! I won't need to come with you to France after all, I found a second wand that likes me a whole lot."
"Ooh, nice. Want to come anyway? You're interesting and I need human friends. And France is neat, from what I've heard."
Miranda goes and introduces herself to owls. A pretty barn owl presents herself and permits petting and picking-up; Miranda purchases her and associated owl supplies.
Sally selects a single-tailed Crup, but returns it after the shopkeeper tells her conversationally that they were bred for Muggle-hunting. She somewhat tearily chooses a half-Kneazle with very soft fur and hugs it with determination. "Wizards," she mumbles disgruntledly.
"Yeah," sighs Miranda. "Wizards. Where did your parents go? I'm not sure my mum would believe you're allowed to go to France if there weren't any parents."
"You're still- not a chaperone," Sally points out. "It's Ms. Halliwell."
Ari pouts, but does not contest the point.