I can't see a baptism and from the 1851 census it looks as if she could be illegitimate as she is with her uncle, John Hurrell, presumably Mary Anne's brother.
HO107; Piece: 1626; Folio: 131; Page: 10
Selling
John Hurrell 50 Farm Lab Moldash, Kent
Mary Hurrell 41 Badlesmere, Kent
Ann Hurrell 23 dau Sheldwich, Kent
Alice Hurrell 9 dau Throwley, Kent
Allen Hurrell 3 son Selling, Kent
Ann Hurrell 16 niece Selling, Kent