Here is my contribution but it’s all conjecture.
This is from the IGI
Name            Robert Nicol 
Spouse:   Agnes Irvine 
Event Date:   21 Aug 1815, Abbotshall, Fife, Scotland
Name           Elisabeth Nichol 
Gender   Female 
Birth:   03 Nov 1816, ABBOTSHALL, FIFE, SCOTLAND 
Father:   Robert Nichol 
Mother:   Agnes Irving
Is this the above Elizabeth with most of her siblings.
Bear in mind the 1841 census rounds ages up or down.
1841 census: Newtown, Abbotshall, Fife, Scotland
Andrew   Nicol   20   1821   Fife, Scotland   
William   Nicol   15   1826   Fife, Scotland   
Betsy   Nicol   25   1816   Fife, Scotland   
Jane   Nicol   25   1816   Fife, Scotland   
Margt   Nicol   20   1821   Fife, Scotland   
Mary      Nicol   15   1826   Fife, Scotland
Is James one of the family but living on his own.
1841 census: Linktown, High Street, Abbotshall, Fife, Scotland
David   Oliphant   20   1821   Fife, Scotland   
Margt   Oliphant   25   1816   Fife, Scotland   
Durham   Robertson   35   1806   Fife, Scotland   
Cathrn   Robertson   77   1764   Fife, Scotland   
Wm   Cooper   60   1781   Fife, Scotland   
Elizabeth   Cooper   60   1781   Fife, Scotland   
James   Nicol   20   1821   Fife, Scotland   
Two James Nicol
1881 census: 199, Links Street, Abbotshall, Kirkcaldy, Fife, Scotland
James   Nicol   Head Married   60    1821   Flax Dresser   Kirkcaldy, Fife, Scotland   
Christian   Nicol   Wife  Married   58    1823   -   Kirkcaldy, Fife, Scotland   
….   
1881 census: 320, High Street, Kirkcaldy, Fife, Scotland
Emelia   Irvine     Widow              71       1810   -   Kirkcaldy, Fife, Scotland   
Isabella   Irvine                             26        1855   Shopkeeper    Kirkcaldy, Fife, Scotland   
James   Nicol   Brother  Widower 60        1821   Shoemaker    Kirkcaldy, Fife, Scotland   
James Nicol, shoemaker, died 1897, High Street, Kirkcaldy.
Widower of Ann Douglas and son of James Nicol & Isabella Greig.