Was it an Angel, a Spirit, a Vision, or...?

My mother passed away about 10 months ago. One of her hobbies was making handmade dolls. She made some that were exquisite.

I was in her basement (cellar) the other day, where she kept some of her dolls. In the central space of the basement, I saw a huge, very ornately decorated doll that looked something like an angel...I couldn't remember a huge doll of this size and decoration being in that spot. I was fooled into believing that it was one of her dolls. I turned and looked away. And then I thought, "There is no doll there". I turned and looked back, and indeed there was nothing there. Was it an angel, a spirit, a vision, some kind of hallucination, or...?