On complaints about her work being complex:
This is ridiculous, I mean, wholly ridiculous. It never did any child any harm to have something that was a tiny bit above them anyway, and I claim that anyone who can follow Doctor Who can follow absolutely anything.She also wrote The Tough Guide To Fantasyland, a satirical sourcebook for bog-standard fantasy.
Some of her work and its adaptations are also distinctly relevant here:
Archer’s Goon concerns a small town where a strange family rules in secret through a variety of powers... including time, as one of them lives in the past and commutes to the present. It was adapted by Children’s BBC during the Who-less years in 1992.
Howl’s Moving Castle (also adapted, fairly loosely, by Studio Ghibli) has an ordinary young woman swept up in the wake of a mysterious man who lives in a castle with a door that opens sometimes in one place and sometimes another...
The Homeward Bounders sets a child adrift across a variety of universes which are, in fact, games played by higher beings.