Damn!! You might actually be right! I was thinking that there must be a motive about these dimensions, I mean all fo them are very distinct. Good thought man!
I believe that it actually IS genjutsu. But she's using Hagoromo's yin-yang element jutsu Obito mentioned during his fight with Konan to turn the illusion into reality. I believe the wiki calls it "creation of all things." It's what Izanagi was derived from.