She's not with her parents on the electoral registers after the war. They were living in the Deptford area in 1918. So she might have been married by then.
A possibility
June 1918 Greenwich 1d 1713
Chapman, May
Cohen, Adolph
There's a death
Sep 1934 Camberwell 1d 650
Cohen, May Louisa
age 49
Age is spot on. Second name Louisa according to new GRO index
Burial is indexed on deceased online, authority Southwark, they have her second name as Louise.
May Louise Cohen, 9 July 1934