https://en.wikipedia.org/wiki/Rivers_of_Blood_speech#Identity_of_the_woman_mentioned_in_the_speech
I don't think your info is up to date.
"Shortly after Powell's death, Kenneth Nock, a Wolverhampton solicitor, wrote to the
Express and Star in April 1998 to claim that his firm had acted for the woman in question, but that he could not name her owing to rules concerning
client confidentiality.
[32] In January 2007, the
BBC Radio Four programme
Document, followed by the
Daily Mail, claimed to have uncovered the woman's identity. They said she was Druscilla Cotterill (1907–1978), the widow of Harry Cotterill, a
battery quartermaster sergeant with the
Royal Artillery who had been killed in
World War II. She lived in Brighton Place in Wolverhampton, which by the 1960s was dominated by immigrant families. In order to increase her income, she rented rooms to lodgers, but did not wish to rent rooms to
West Indians and stopped taking in any lodgers when the
Race Relations Act 1968 banned racial discrimination in housing. She locked up the spare rooms and lived only in two rooms of the house. According to those who remember the period, the many children in the street regarded her as a figure of fun and taunted her.
[33]"