Well, I'm taking a short break from Breaker Of The Fourth Wall to explore an interesting idea.
Flandre is referred to by fanon as either the victim, driven mad by her own power...
Or the sadist, using her power to make others' lives miserable.
But the Eye crushing isn't conducive to the sadistic image, being a quick way to die.
It begins with an attempt to help poor Flandre gone horribly wrong...
My idea of the story so far.
Patchouli feels sorry for Flandre, and tries to lock away her ability to crush Eyes, bringing her one step closer to normal society. This proves about as helpful as Koishi trying to lock away her Third Eye. Less so, in fact. Much like Koishi gained the power to meddle with other people's minds instead of read them, Flandre gains a power far worse than merely destroying the Eye. She is able to meddle with it, changing the size of it, and by extension, the scale of the object OR PERSON. And even worse, she can meddle with her OWN Eye. Over the course of a single night, while everyone is asleep, she creates an incident that is the SMALLEST SCALE incident Gensokyo has ever seen, but would have LARGE REPRECUSSIONS... (Subtle hinting at the storyline for whoever's clever enough to figure it out) An incident so well cloaked, it would take the residents a while to notice something was up. A time Flandre spent honing her newfound abilities, waiting to put them to the test when the Shrine Maiden showed up to end the fun, as she inevitably would...