Her name is Mary Lea Williams.
I found this video and posted this video on my Facebook on Sunday, and was shocked to see the full interview of this woman within it. She has a very brief spot in the documentary "Four Days in November, from 1964.
Although the film crew mentioned her name as "Mrs___", the microphone didnt capture her ful lastl name, and Bill Brown took the time to figure out the portion of her last name as it appears.
He then responded to my FB post , and posted her affidavit as published in the 26 volumes of the WR. She worked at the TSBD. My first thought was that she was the woman standing with Doris Mumford near the lamppost as seen in the Z film and Bronson photo. According to her, though, she was standing with 4 other women who worked at the TSBD, and a 4 year old child of one of the women. Warren Commission exhibit 1381 is her affidavit.
Video:
Miss Williams appears at 1:06 into the video.