Horror film involving a woman seeing a phantom behind her

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?

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