On one occasion, there were plants that became monsters and attacked residents. On one occasion, residents of the gardens were turned into monsters and attacked each other. Another time, there was a door to another world opened here. That world, too, was populated by monsters, which came through and attacked in large numbers. Once, robots swept through the gardens, destroying all they came across.

I believe it is due to her unstable nature, or that of her realm, but not her direct doing. It is not her will. She would, to all appearances, and according to her own words, prefer to keep us here.