The 1916 Death index NSW Australia, for Ann WARRY in Mudgee district, lists her parents as Benjamin & Maria.
http://www.bdm.nsw.gov.au/familyHistory/searchHistoricalRecords.htmThis looks like her parents 1841/1851 - but Ann not with them :
1841: Water Lane, Chesham, Buckinghamshire
HO107 / Piece 47 / Book: 2 / Folio: 5/ Pg 4
Benjamin HORWOOD 36, Tailor
Maria HORWOOD 37
Henry HORWOOD 14
Joseph HORWOOD 7
William HORWOOD 5
Charles HORWOOD 3
Thomas HORWOOD 1
1851: Chesham, Buckinghamshire
HO107 / Piece: 1717 / Folio: 102 / Pg 27
Head: Benjamin HORWOOD 46, Tailor, b Chesham, Bucks
Wife: Maria HORWOOD 47, b Chesham, Bucks
Son: Joseph HORWOOD 17, unm, At home, b London Mdx
Son: William HORWOOD 15, At home, b Chesham, Bucks
Son: Charles F. HORWOOD 13, Errand boy, b Chesham, Bucks
Son: Thomas HORWOOD 11, Scholar, b Chesham, Bucks
Dau: Elizabeth HORWOOD 8, at home, b Chesham, Bucks
Dau: Emily HORWOOD 4, b Chesham, Bucks
Dau: Ellen M HORWOOD 1, b Chesham, Bucks
Search Labs:
https://labs.familysearch.org/Have a Benjamin HORWOOD ch 10 Mar 1805, Chesham - parents: Henry HORWOOD & Hannah.
My guess is Ann is at Grandad Henry HORWOODs in 1841.
Cheers
AMBLY