Division?! Small room / steep slope / radiator

... if you attached a floor plan in post 12, it cannot be seen. Please make a drawing.

One more attempt to insert the floor plans:
It is about the room labeled: Eltern

You probably cannot sketch a floor plan of the room's current state on paper? The window is already incorrect and the roof windows are not marked either.

So... I’m not going to put the floor plan on paper now It’s up to you to now implement this for your daughter: graph paper and pencil. Only you know the furniture dimensions and also the implementation of the windows with the radiator!

As already mentioned, install a knee wall cabinet at about 80 cm and then when entering, a bed should easily fit against the wall on the left.

Alternatively: a loft bed, bottom edge of the bed = top edge of the window, built into the peak and without posts, attached only to the walls. Something like this, only I would have the ladder go vertically up the inside wall; this "post" could be covered from the back as a shelf and also be used that way.



But here too, a knee wall cabinet would be suitable.

This all sounds less like an interior designer and more like a clever carpenter!

I would now also suggest a loft bed and if the child has such a problem sleeping under the sloping roof (why actually? Generally or because the knee wall is so low that you hit your head if there is a bed against the outer wall?), then I would make a gallery on the side with the 3.50m, at a height so that it lies above the door. Not just a loft bed, but a gallery that contains a bed. Everything else is a drama for making the bed. A little space around the bed is extremely helpful. The height of the gallery is then up to 1.50m, so not particularly high. Otherwise, I don't see any other possibility if the young lady strictly refuses to sleep under a sloping roof at all (not even with her feet under the slope). The question is whether she would even be willing to sleep on this gallery if the sloping roof is already a problem. Setting the gallery lower than the top edge of the door/window is problematic here because then you practically block the window. So do not be misled by the picture above! The height proportions are reversed there, but the window is also where here the interior wall to the other room is. So you can only install a loft bed here, being aware that either the window will be blocked (if you want more space above and only a cozy cave below, as in the picture above) or you have to be satisfied with about 1.50m height. Since the girl does not want to sleep under the sloping roof, I would first clarify whether a sleeping area with so little headroom would be accepted at all and — please spend some time in reflection yourself — whether mom is willing to always make her daughter's bed in a bent-over position.