There is a house, and in the house is a bed, and in the bed is a girl. She sleeps soundly, curled up very small under her blanket, while a steady accumulation of snow makes round soft piles on the roof and against the outsides of the walls.
There is a place that is recognizably a kitchen, with a set of cupboards, a pantry, and a large strange humming box filled with fresh food. Apparently it keeps things cold: there is an interesting little box at its base, pumping hot air out of the insulated compartment.
What an... object.
Are there any people around? She would like to avoid them if so. She does not want to interact with any people at this time.
Good enough.
Her real body sneaks down to the kitchen and acquires an acceptable quantity of food and sneaks back up to her room. Then she sits on her bed and eats while her reflection pokes around to examine the reflected house.
There are all sorts of unusual objects. Some are recognizable variations on things she knows: some are completely foreign to her. Many things are made of a strange, unnaturally smooth material, like the black, polished bones of some ancient beast. Copper wires snake this way and that, through the walls, from one strange device to another: what arcane purpose could they serve...?
It's very odd. But when she follows and studies the wires, she figures out soon enough that they connect to mysterious objects. Some sort of bizarre local magic. This must be a strange place indeed, to have produced the bone-hearted shadow with the golden-chained mouth. It makes sense that there would be all kinds of bizarre magic here.
Now she is done eating the food. Her reflection returns to her reflected room, and curls up in bed at the same time as she does. But only the reflection cries.
At least her dreams still work right. She lies in bed and watches the dreamscape fade out of her selfspace as the reflections of her surroundings fade in.
Still the same strange room.
Still the same strange city.
Still the same strange world.
She sits up after a few minutes and sends her reflection out to check if it's safe to go get food again without running into any people.
People appear to be having breakfast in the kitchen. One of them wonders aloud where she is.
She does not want to talk to anyone. Maybe if she waits for a while they will go somewhere else and she can get herself some breakfast.
It appears that one of them has decided to go knock on the door to her room.
There is a window in her room. It's not too far to the ground, and she knows parkour. She has options.
...
She will fret. And patrol the reflected corridors of the house looking for a good time to sneak downstairs and get more food without having to interact with any humans.
Good. Now she can eat breakfast.
And...
...and do what, really? What is there to do? Where is there to go? She lives in a city now. This is wrong. Cities are full of people and people are troublesome.
Well... she did get all that parkour.
Maybe she can go climbing.