"We ran late because Mum wanted to walk as it's a nice day, and it wasn't making us late enough that I could argue her into taking the Underground." Most of the compartments are occupied; they have to duck around the snack cart to get past lots of full ones. Eventually there is an empty one. Miranda ducks in to claim it.
"The Underground?" Emma asks curiously. "Oh, uh, that's that Muggle train, right?"
"Yes. Renée - that's my mum - doesn't like the Floo. She has a broom but I don't fit on it so even if she Disillusions us it doesn't mean we can fly around in the middle of London."
"I haven't taken the Floo much," Emma admits, "but I kinda see her point? It's, um, not the most comfortable thing in the world. Mother found us a Portkey to the station; that's kinda why we were so early."
"Okay, is there, like, a cheat sheet or something?" Jenny asks plaintively. "Magic to Muggle dictionaries? Wizarding Gobbledigook 101? Help, someone, take pity on the confused Muggle please!"
"Sorry," says Miranda. "The Floo is a way to go from one fireplace to another by magic, but it makes my mum dizzy and it's also very hard to land on your feet. A Portkey is a thing that is enchanted so if you touch it, it puts you somewhere else. Brooms fly. And there's this train, which is somewhat magical but mostly only a train, and in other countries there are are magic carpets but not so much here, and apart from, like, things like sitting on magical animals and special-purpose-built things that aren't any of them very common, that's most of the wizard methods of getting around."
She makes an exaggeratedly sad face, and switches her hair to a rather dismal shade of blue-grey just for emphasis. "See? So very sad."
And, after a second's thought- "...is there a female form of that? Metamorphmaga? I mean, um, it's kind of Latin. I've never heard it, though."
It's not particularly efficient- it's noticeably slower than even the unicorn horn- but her hair does start to move into a braid-like form.
"I think it's just Metamorphmagus for boys or girls. But if you want to say 'witch or wizard' without it taking all day you can say 'wix', and like - at least the sort of person Renée hangs around with will know what you mean." She supervises the braiding process with fascination.
Her hair has made it successfully into a braid. It's not elaborate, nothing she couldn't have done with her hands- not even a French braid- but it's definitely a braid now. She beams.
"I did it! Eeeeee! Gimme something else to try?"
"Mm cn-" she starts, then decides not to try talking around the beak and turns her face back before she continues. "I can do feathers too! Couldn't get actual wings, but these worked-"
And swan feathers sprout from her head, trailing down alongside her hair decoratively. When she has them arranged to her liking, she turns them purple. "Free hairclips! But, er, don't pull them out please. Thaaaat hurts." She sighs. "Brothers."
"How many siblings do you have? ...I'm not going to pull them but if you make feathers and someone pulls them out do they stay feathers after?"
She can pull them out herself, she knows how. Careful about how she dislodges them, she removes the closest feather. It promptly turns back to a small cluster of hair. "Errrrr, whoops. Did not think that through, did I?" Failing to spot a trash can, she ties the hapless lock back around her hairtie.
"It must be nice having siblings," Emma says somewhat wistfully. "Even that many."
"I don't have any. I don't know if I would like them but I don't think I particularly want them. Jenny, do you want me to see if I can Vanish the extra hair? I don't know if I can, but we're allowed to do magic once we're on the train so I can try."
"Sure! I haven't actually seen anyone use a wand- well, except the whole 'my wand turned into a sparkler when I picked it up' thing- so I am totally on board. Also, y'know, thanks."
She points her Ollivander wand at the extra hair and says firmly, "Evanesco," just like her mum cleaning up a spill.
Nothing.
"I'm probably missing something. I don't think it's in the first year textbooks or I'd look it up."
Since the spell is not in fact "Evesco", unsurprisingly, nothing happens.
"It was about half a joke? I mean, I've seen my wand go all sparkler, it seemed like maybe a thing."