I'm sorry, it wasn't her death registration but that of her son Eustace Barron PROBST in 1934 where his mother was transcribed as Mary Javis Jock, born in Tavis Jock, Kent. I didn't have the patience to go through all of the records to read the original document, but it is available on FamilySearch https://www.familysearch.org/ark:/61903/1:1:FPJ6-GRC