Here are two of the requested marriage lookups -
Both Thomas and Lena May Moody's marriages took place at the King Street Independent Chapel (which is down Sandy Bay way)
Thomas' occurred on the 18/04/1907 - residence: Sandfly, age: 33, Farmer, born: Hobart, Parents: James Moody and Elizabeth Smith. Witness': Mark Wallis, 330 Elizabeth Street, Mary Ann Glorchey.
Lena May's occurred on the 8/04/1912 - residence Hobart, age: 28, domestic duties, born: Sandy Bay Parents: James Moody and Elizabeth Johns. Witness': M L Palfreyman, Hobart, T R Coulson, Geeveston.
Given that the JOHNS/SMITH surnames have cropped up in relation to Elizabeth Jones and also the Brent/Smith/Moody connection in the post by Debrah could this below be the key to Elizabeth Jones' origins -
http://archiver.rootsweb.ancestry.com/th/read/AUS-Tasmania/2006-08/1154559866Cheers,
Peter