When I was 12 years old in the early 1970's, I experienced a very strange happening that I don't share with too many people I know because I'd sound crazy.
I was in my bedroom and brushing my long hair while looking in a large mirror above my dresser. I heard a hissing sound and saw something coming from my bed area across the room and then felt it touch the hair on the left side of my head. It then hit my mirror and looked like phlegmy spit as it dripped down the mirror. I screamed and my parents came running into my room.
It was totally unexplainable. I had been alone in my room. My parents were baffled. They didn't make a big deal about it.
I went on to have other unexplainable experiences in my childhood house for several years. I saw an image in my den that looked like a ghostly image of a woman with long red hair walking past the room I was in. Another experience that my parents searched the lower level of the house I was in and found nothing.
Many years after moving out of the house, my older brother told me he saw a similar image looking down the stairs to the lower level. I also would hear a faint women's voice calling out my name several times during my youth. There was only one time that someone else heard it (my younger brother).
I came upon this website while watching a poltergeist tv show. I was amazed that my experiences were similar to other people's experiences. I've had less frequent experiences as an adult. Strange phenomenon still happen randomly when I least expect. I'm Catholic and feel safe when I pray. Feels good to share my experience.
Maybe she spit at you in a moment of pique because she saw in that scene while you stood brushing your hair, a time from her own life when she was young and everything was simple (age of onset for many mental disorders is 18-25).
I could be completely off in this thought and, believe me, I am not trying to cast aspersions on anyone managing mental illness. This is just the way the situation read to me.