|Born||1874 Epsom, Surrey|
|Died||1938 Blyth, Sussex.|
|Father||Alan Brooksby COBBOLD (1830 – 1901)|
|Mother||Harriet Parker Valentina BARTHOLOMEW (1838 – 1903)|
Mattie was baptised with the name Mattie on 21/11/1878 Sutton, Surrey.
Mattie was living at Blythburgh, Suffolk on 25/8/1917 when she volunteered for nursing duties at the Patrick Stead Hospital, Halesworth, Suffolk.
She died unmarried.