Hello Uboachan. I have returned...With a theory!
Okie dokie. People have made theories about madotsuki's NASU, her pillows, bed, and everything else BUT...
There is a huge fucking bookcase. Right there.
You see, because Mado never leaves her home, and that her TV is out, there is no way for her to dream about deserts, malls, and forests because she has never really seen them before.
However, it seems that Mado is well read. And when you read a book and it talks about something you dont know about, it is hard to visualize in your head.
When madotsuki reads of such places, her way of imagining it is limited.
If she read about the mall, the book probably said there was a lot of people.
To madotsuki, a few random people wandering is a lot.
Sorry if this is badly worded, i suck at organizing ideas.