This seems highly unlikely to be what actually is, of course, but that is sure what appears to be.
She is trudging morosely through town, attracting odd looks, peering around at everything.
Okay, he can play an elaborate game of play-pretend with a kid for a while. He's fine with that.
"Oh. Well. How does the magic work, you get a door to - Milliways, the bar, and. What, you just get some?"
"Get what?" asks the girl.
"Bar not give it. Get other people from."
"So you go to the bar and meet people with magic in it."
"Mmhm! And the ones Mommies sharing all all so all ones magic magic."
"Mommies have lots of different magic and they share...?" he deciphers.
"Mmhm. My one none magic, got from more ones."
"Why are there multiple mommies?"
"Dunno. So many of, though! And Daddies. Also three Dars two Keziah two Ariel, one me only, one Pen."
"Dars, Keziah, and Ariel being...? Siblings?
"Okay, so there are. Multiple mommies and daddies and sisters and they all meet in this bar."
"Yes. Got to finding it again, say 'Jane home please'."
"Who is Jane? An aunt?"
"Nn-nn, cousinoid computer person."
"What is a computer person?"
"Is person who not so a place. Jane sort of place, mostly not place. Think other computer persons maybe more place? But not so much place."
"A. Person who is not. Anywhere in particular, but - everywhere? Or. In lots of places at once?" he hedges.
"Yeah. Wish having Jane gem. Jane be part in gem, see hear put do take whatever. If I a gem then not lost, she home me or put Mommy here, something."
"So Jane is a person that is in lots of jewels. Okay. I don't suppose it's possible to find one of her gems?"
"Have to make," says Pen, shaking her head, "put some of gem one the Jane places, keep other piece, can't find. If Jane here I already talk her."
"Okay. So that's out. Door's the only way, then. And I don't have the magic that makes doors like me."
"No. Sometime door only just like people no magic though. Try?"