There is no parallel universe or alternate reality. This isn't Star Trek, jeez. She simply chooses not to see reality. If I were you, I wouldn't continue with her. It's too much potential for drama - look at how fucked up and confused you feel now, at this early stage - it will only get worse. Personally, I prefer partners who can handle the truth and live with both feet on the ground. I highly recommend you do the same.
The world opens up... when you do.
Oh, oh, can't you see? Love is the drug for me. ~Bryan Ferry
"Love is that condition in which another person's happiness is essential to your own." ~Robert Heinlein