Okay, first of all: I'm an idiot. I realized that I'm looking answers from wrong place. I didn't do, what all those instructions for lucid dreaming etc. did tell to do in situation like this. At least, not after my first sleep paralysis.
When the bearcentaur appeared second time in my dream, I did ask her who she is, but I never got answer. But that might be the solution here! I should have looked answers for all these over two weeks from inside my head, not from internet and library books.
So my plan for tonight; I will lucid dream, summon her and ask her who is she and what does she mean? Is she causing the odd happenings and if she is, why?
Again, wish me luck.