I saw a black & white horror flick on tv sometime between 1988-90. I can’t remember the plot, only that this woman, who thought she was losing her mind, kept seeing a dark human shaped phantom behind her in the reflection of her house’s mirrors. Every time she looked in the mirror, the evil phantom got closer & closer, increasing the suspense.
Small Details: I don’t think anyone else could see the phantom. I don’t think she ever left her house.
Could this have been an Alfred Hitchcock episode?
Repulsion(1965)?
Probably not it, but you might want to check out The Hungry Glass, an episode of Thriller hosted by Boris Karloff.