Kind erkend bij huwelijk ouders d.d. 14 december 1912
She is married to Marten Hamstra.
They got married on July 27, 1918 at Sneek (Fr), she was 18 years old.Source 3
The couple were divorced from October 25, 1934 at Leeuwarden (Fr).
Geboorteregister 1900, Sneek
https://www.graftombe.nl/names/info/1938288/walstra
Huwelijksregister 1918, Sneek