and to confirm, here is Margaret Hutton in 51 before she married John Costine. She is at the same address, same age and same occupation as margaret Costine so I am sure she is the same person.
HUTTON, Margaret Head Widow F 36 1815 Proprietors Of Houses
Kirkcudbright
Kirkcudbright N/A
HUTTON, James Son M 8 1843 Scholar
Troqueer
Kirkcudbright N/A
HUTTON, John Mary Daughter F 1 1850
Troqueer
Kirkcudbright N/A
MCGREGOR, Jane Servant F 17 1834 House Servant
Urr
Kirkcudbright N/A
Piece:882
Folio:222
Page: 36
Registration District: 36
Civil Parish: Troqueer
Municipal Borough:
Address: Chenter House, Chenter House, Troqueer
County: Kirkcudbrightshire
HUTTON, Margaret Head Widow F 36 1815 Proprietors Of Houses
Kirkcudbright
Kirkcudbright N/A
HUTTON, James Son M 8 1843 Scholar
Troqueer
Kirkcudbright N/A
HUTTON, John Mary Daughter F 1 1850
Troqueer
Kirkcudbright N/A
MCGREGOR, Jane Servant F 17 1834 House Servant
Urr
Kirkcudbright N/A
Piece:882
Folio:222
Page: 36
Registration District: 36
Civil Parish: Troqueer
Municipal Borough:
Address: Chenter House, Chenter House, Troqueer
County: Kirkcudbrightshire