Elizabeth Fisher was born circa 1820 in Kintbury and her sister Caroline circa 1822/23.
Mother's name was Jane.
I can't seem to find a baptism anywhere for them, any help much appreciated.
Yes, mother's name, Jane, is taken from the census.
In 1881 and 1891 Jane Fisher is living with her daughter Caroline who is by then married to Abraham Hopkins.
I haven't yet found Jane Fisher on any earlier census reports... there are a few possibilities but as I don't yet know her husband's name I haven't pursued that very much yet.
I'm not seeing a marriage for a Caroline Fisher to Abraham Hopkins

there is this marriage entry FreeBMD
Caroline COLBOURN married 1842 Wantage Berkshire
name on same page
Abraham Hopkins1851c HO107; Piece: 1689; Folio: 281; Page: 26;
Abraham
HOPKINS 31
CAROLINE 28 (1823) Kintbury BerkshireEliza 7 Elizabeth 5 Joseph 4 Mary 2 James 2 mths
1881 RG11; Piece: 1273; Folio: 26; Page: 13
Abraham HOPKINS 60
CAROLINE 58 KintburyJane
FISHER widow 88 Totnes Devon
then there is this baptism
Caroline Colbourn Christening 22 Sep 1822
Kintbury, Berkshire
Father John Colbourn
Mother Janeand here they are on the 1841 census
HO107; P 21; Book: 14; Civil Parish:
KintburyED3; F14; P 22
John
COULBOURN 60
Jane 45
CAROLINE 15 Thomas 15 Charles 14 Joseph 12 Alfred 9 Jane 8 Ann 6 Daniel 7 William 2
Caroline Hopkins of Kintbury Berkshire widow died 6 April 1916
Probate London 3 May to jospeh Hopkins Shepherd Effects £66 2s. 6d
1871 RG10; Piece: 1255; Folio: 81; Page: 23
George SMITH 60
ELIZABETH 52 (1819)
KintburyFrancis 13 Harry Tom 11
Jane
FISHER mother in law 78 Devonport
1861 RG 9; Piece: 724; Folio: 118; Page: 24
George SMITH 50,
ELIZABETH 43 Kintbury
Elizabeth jane 21, Isabella J 17 Charles H 14 Roda M 12 George W 10 James A 7 Frederick W 5 Francis J 3 Henry T 7 mths
1851 HO107; Piece: 1686; Folio: 315; Page: 2
George SMITH 39
ELIZABETH 31 KintburyJane 11, Mary A 10, Isabella 5, Charles 4, Merian 2, George W 3 weeks
1841 HO107; P1184; Book: 15; Civil Parish: Ramsbury Wiltshire; ED: 14; F 11; P15
George SMITH 30
ELIZABETH 22
Jane 2, Mary 6 mths
Isabella MASON 14
Elizabeth Colbourn Christening 25 Apr 1819
KintburyParents John Colbourn & Jane
1851 census HO107; Piece: 1686; Folio: 36; Page: 33 living Kintbury
John
COLBOURN 70 Kintbury Jane 60 Drewstanton Devon
Charles 25 Daniel 17 William 13 Mary 10
Mary
FISHER sister 72 Kintbury
Mary ColbornJohn Fisher
Marriage 24 Oct 1801 Kintbury
Mary ColeborneChristening 4 Jun 1779 Kintbury
Parents Jonathan Coleborne & Harriet
I wonder if Elizabeth & Caroline’s mother Jane remarried there’s this marriage entry
Jane COLEBOURNE name on same page
Thomas FISHERDec 1861 Hungerford Berkshire