There is in Ancestry a 'Joyce Family Tree' [owner 'thecrowfamily'] which has Harriett's death as Oct 1969 in Bexley.
However, there is no supporting source document attached to this entry.
By the by, I see what you mean about Aunt Ett having a very colourful life - if the news reports in April 1930 regarding her husband Richard's alleged decapitation on a railway line are anything to go by!
Willyam