Need help with interpretation

In that dream, I was at my GF's place alongside her and her parents, we were all watching TV, then I look to the stairs, and I hear someone coming down, but there's nothing but some sort of shadow. My girlfriend is very sensitive, so naturally I asked her I she saw that, but she wasn't listening to me even though I was literally laying on her. The shadow then starts to go up the stairs, and my GF'S father hears it, go check, and nothing. I then go to the kitchen, and when coming back I see my gf in the stairs, facing the wall, when I come close she looks at me, but she has a very weird, kind of old face, much like Mia in Resident Evil 7. This version of her goes up the stairs and I follow her (or it) to check. When I get there my actual girlfriend comes out of one room with a smile in her face, and right after that evil twin comes too, with a much bigger smile and a very ugly, weird, old face. They both come in my direction as if they're going to harm me, then I wake up. It was fucking terrifying.