I've just started researching my Sentance side of the family. My great grandma Elizabeth Sentance, born 1858, Norwell, Nottingham. 
She married Henry Bartholomew Carter (from Roxby, Lincolnshire) in 1883, Hawton, Notts and they moved to Sheffield, South Yorkshire. Their marriage certificate shows her father as William Sentance, Shepherd.  
Do you have Elizabeth's birth certificate showing parents names? 
If not, you can obtain a digital image from GRO cost £3.00 and  the image is available to view once payment is complete and a link to the image is provided on the order confirmation screen. 
SENTANCE, ELIZABETH   
mmn HORTONGRO Reference: 1858  S Quarter in SOUTHWELL, NOTTS  Volume 07B  Page 257   
Mary's husband not with her on 1861 census  
 
  Surname transcribed as SENTAWER on Anc*y
1861 c Piece   2474
Folio   83
Page number   19   
Mary  21   Head Ag lab’s wife
Elizabeth    2   Daughter
William H    2m   son   
SENTANCE, WILLIAM  HENRY   
mmn HORTON   GRO Reference: 1861  M Quarter in SOUTHWELL, NOTTS  Volume 07B  Page 274
1871 census husband named John  

1871 census Piece   3537
Folio   56
Page number   2   
John Sentance   35   Head occ 
ShepherdMary Sentance   31   Wife
Elizabeth Sentance   12   Daughter
William Sentance   10   son
Sarah A Sentance   7   Daughter
Fanny Sentance   6   Daughter
Mary Sentance   4   Daughter
John Sentance   9/12   Son
SENTANCE, SARAH  ANN   mmn HORTON
GRO Reference: 1863  J Quarter in SOUTHWELL NOTTS  Volume 07B  Page 284   
SENTANCE, FANNY   mmnHORTON
GRO Reference: 1865  J Quarter in SOUTHWELL NOTTS  Volume 07B  Page 287   
SENTANCE, MARY   mmm HORTON
GRO Reference: 1867  M Quarter in SOUTHWELL, NOTTS  Volume 07B  Page 286   
SENTANCE, GEORGE   mmm HORTON
GRO Reference: 1868  J Quarter in SOUTHWELL, NOTTS  Volume 07B  Page 293   
SENTANCE, JOHN   mmn HORTON
GRO Reference: 1870  S Quarter in SOUTHWELL, NOTTS  Volume 07B  Page 292   
This is the only Sentance marriage entry to a Mary Horton 
John Isaac Sentence
Registration Dec 1857 Newark Nottinghamshire Volume   7b Page   519
Records on Page (Name)
Mary Hooton
Mary Horton