There is this birth?
September qtr 1909
Wandsworth Registration District vol 1d, page 614
Taylor, Dorothy May P
Which fits with her stated date of birth on the Death Registration:
March qtr 1991
Canterbury Registration District vol 16, page 170
Shennan, Dorothy May P Date of Birth 2nd June 1909
What I am getting at is that there doesn't appear to be a previous marriage!