Info to enable others to help.
If Annie's age is accurate on her marriage certificate then I would suggest she was born c1850 and if born in South Australia her birth wasn't registered.
MEGLER Robert 31 years Status single Father John MEGLER
WOODS Annie 18 years Status single Father Daniel WOODS
2 Mar 1868
At Presbyterian Manse Flinders St Adelaide Ade 75/3
Births
MEYLER Agnes
3 Aug 1869
Father Robert MEYLER Mother Annie WOODS
At Clare Cla 75/198
MEYLER Stanley John
13 Dec 1872
Father Robert MEYLER Mother Annie WOODS
At Hanson Cla 115/558
Annie eldest dau stated that she has two stepsisters.
Birth of child on the train who died the next day.
CARRINGTON Peter
18 May 1881
Father not recorded Mother Annie CARRINGTON
Birth place not recorded Kap 261/426
This news report rings a bell with me. Have we helped you previously?
South Australian Register 24 May 1881
http://nla.gov.au/nla.news-article43156974AN EXTRAORDINARY CASE.
CORONER'S INQUEST.
On Saturday morning, May 21, Mr. J. Elliott, J.P., held, an enquiry at the Hospital, Kapunda, respecting the death of a woman named Annie Carrington, who had been prematurely confined
in the train whilst being taken from Morgan to Kapunda by Police-trooper Waters. Mr. E. Riley was foreman of the Jury. John K. Ewens, corporal in charge of the Morgan Station, deposed that the body was that of a woman whom he had known at Morgan during the last three or four months. She represented herself to be a married woman, her husband being imprisoned in Redruth Gaol. She had four children, and being in destitute circumstances had been provided with Government rations. Her character was not good. On Thursday, the 12th, deceased's little girl re ported that her mother was ill......................
Clara Agne Meyler, ten years old, deposed that deceased was her mother. Witness's father was dead, and her mother had married again, her name being Annie Carrington. Mr. Carrington had not lived with them at Morgan, but did so at the Burra before they came to Morgan. He was at present in the Burra Hospital, so her mother said...........
Her mother had received a letter stating that witness's father was dead. She had an uncle in Queensland, and the late Dr. Webb, of Clare, was also her uncle....................
Cando