I think what I’m rememering a 1950s movie about a murder trial, where the accused is the spoiled rotten daughter of a woman who was played by, or resembled, Shirley Winters.  The daughter took the mother for everything she had during the trial, and at the end defiantly put on a wig to prove she was the woman who had been identified by a witness as the murderer.  If anyone can make sense of this, I’d love to know.