Next time I think you should listen to the young girl! 
That didn’t help too much, did it? Well how about this… It actually sounds like a version of Old Hag, sans the sleep paralysis bit. Maybe the girl was real (who knows her reason), and her message freaked you out a bit and led to an Old Hag type of dream.
Or maybe they were both some sort of weird interdimensional beings… 
Or maybe the girl was a hallucination… 
I could go on and on… But I don’t think anyone can really tell you for sure what it was. The Starship Gaia? Nevermind, I won’t ask…