I cannot find a marriage for Gwenllian/Winifred JENKINS to a Ebenezer JONES in South Australia.
Information on certificates in South Australia - marriage certificate would not give you her place of birth.
http://www.rootschat.com/forum/index.php?topic=368744.0Births in South Australia
JONES John
13 Aug 1865
Father Ebenezer JONES Mother Gwen JENKINS
At Kapunda Kap 36/898
JONES Mary Anne
8 Sep 1868
Father Ebenezer JONES Mother Gwin JENKINS
At Kapunda Kap 67/562
Birth in Victoria
JONES Winifred
Father Ebenezer Mother Gwenllian JENKINS
At Sebastopol 1871 Reg#19636
From the Biographical Index of South Australian 1836-1885 Not always 100% accurate and there are errors and ommisions.
It would appear that neither of these Ebenezer's married in SA.
JONES Ebenezer born c1846 GLA WLS died after 1876. He arrived in 1864 on the
Art Union Occupation Miner, Plasterer. Lived Adelaide.
JONES Ebenezer born c1836 GLA WLS and died after 1880 He arrived in 1860
Ramillies He was a miner and labourer and lived at North Adelaide. Religion - SOF.
Cando
Amended to add name.