Which bit are you stuck on Shann? Your Grandmothers record is blanked out on the 1939 household register, she wont appear on any of the published Census records as the most recent census published is the 1911 England and Wales Census, The 1921 Census should be published in January 2022 at Find My Past. You Have her Birth and Marriage GRO Ref now so you can order certificates if you wanted but you already know her birth date and mothers maiden name, I've found her parents and siblings, so I'm not sure what else there is to find.