Oh I am, I am. Problem is, if things go right and it ends up being successful, it'll span towards a bit more than a dozen volumes just to finish the entire plot.
Take it from a debuting author - this will happen. You write something, scribble out a little fantasy that's been stewing in the mind's void. But then comes the logic. The questions of who what, when, where, why, and of course How are demanded. The reader's curiosities have been piqued, but now one has show the end of the rabbit hole, one that will actually lead them out, so to find another.
The two worlds are two dimensions. That's how she's just gonna fade because she must have messed up traveling through those two dimensions. And damn. Thats really cool.
Your right on the first part, but wrong on the second and third. I'm only going to say that the character is a he though, not a she. And thanks for the compliment.