Maybe the girl has intentions and manifestations because you BELIEVE deep down inside that everyone has them? The universe is subjective, but not just how you conciously want it to be; you gotta throw your subconcious into the equation, too. I think that you believe that you're human, and can manifest things, so every other human can too. The other thing is that if you think too hard about the universe being subjective, it gets really confusing. For example, I'm all in your head if you look at it from your point of view, but then the universe is all in my head from my point of view. It isn't something that can be easily pinned down.