Welcome to Rootschat.
It looks as though she was born 24 August 1925, registered in Southwark as you say, with mother’s maiden name Sibley.
She married Albert Edward Armsworth (b 7 Sep 1906) in Southwark in 1952.
By 1963 (electoral roll) they were living at 161 Northwood Rd, Upper Norwood.
Albert died in Chichester in 1970, but Joyce seems to have lived a long life - is there any chance she is still living? If so I will have to redact her details.