TV movie about a middle-age wallflower

I think it was a TV movie (it was a movie on TV anyway) in the 1970s, about a middle-aged woman — I feel like it was Maureen Stapleton, or someone who looked like her, but researching her movies doesn’t turn up anything similar — who goes to a formal dance — by herself? with a man, but comes home by herself? What I really remember is the mood, sad, poignant, life having passed her by. Help?

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