>>3319531
There are more ways to entertain yourself then to read books. Though I admit Flandre would probably seek to understand the world through books, I can't imagine her trying to understand more about magic then she needs to, it's pointless after a while as she doesn't really have any ambitions and powers granted through magic aren't likely to be any more destructive then she can already be... through creation probably has it's uses.
I imagine she amuses herself other ways, playing like a child would alone fits her character, only with more knowledge. Perhaps she grows bored of fiction and started to write her own plays, plays she enacts by herself, or with her duplication and toys.
If Flandre was a bookish type, it would be made more apparent in her character. Flandre's main characteristic is the fact she's a kind of crazy recluse, childish in nature but well spoken enough to talk normally (at least for Gensokyo standards).
The world is hers to create... in her imagination.