There is a baptism 1 Jan 1854 at Bradford St Peter (Bradford Cathedral): Hannah, now wife of Thomas Hird, born 16 Jan 1821, parents Thomas and Sarah Butterfield of Heaton, father's occupation Comber.
http://interactive.ancestry.co.uk/22...nSearchResults
So if Thomas and Sarah lived at Heaton, this could be a child of Thomas's by his previous wife? 5 Jul 1812 baptism at Bingley All Saints: Sally, born 18 Dec 1811, daughter of Thos Butterfield of Heaton Royd, parish of Bradford, father's occupation Comber.
http://interactive.ancestry.co.uk/22...nSearchResults
Edit - but if so, I can't find a likely burial for her mother, so maybe this is a red herring!