Don't know where to start without buying lots of certificates.
Stitched message from her mother,
Sarah Wells,
born 25th october 1842,
died 17th march 1848 buried under tree in churchyard.
If it is Essex, then there is only one possible birth that I can see:
Oct/Nov/Dec 1842
Halstead
ref 12 102
Sarah Wells
A possibility for her parents, if she is from Halstead ?
To be certain it's the correct family Sarah's b/c would confirm parents namesMarriageSep 1839 Halstead
Richard WELLSFemale names on same page
Maria Andrews
Marty Ann Cutts
Mary Gozzard
Anne SAMSmarriage 2 Sep 1839
https://familysearch.org/ark:/61903/1:1:XK8G-4431841 census administrative area Halstead Union, Halstead
Richard WELLS 25
Ann 25
James 1
Death Halstead Sep 1850
Ann WELLS buried Halstead 1 Sep 1850 age 32
https://familysearch.org/ark:/61903/1:1:QJD4-72BK1851 census administrative area Halstead
Richard WELLS 35
James 11 (born c 1840 FreeBMD Mar 1840 Halsted)
Ann 7 (born c 1844 FreeBMD Dec 1843 Halstead)
1861 census Halstead
Richard WELLS 45
Eliza 39
James 21
Ann 18
Eliza 15
William 9
Maria 8
Henry 2
Lewis (Sep 1860 Halstead)
It looks as if all the above children birth entries in Halstead district see FreeBMD)
possible ch. James 1 April 1852 Halstead
parents Richard Wells & Ann https://familysearch.org/ark:/61903/1:1:XK8P-7SZ also Ann & William on same day
Ch. Halstead
parents Richard WELLS & Eliza (see familysearch)
Maria 1 Apr 1853, Eliza 25 Mar 1856, Henry Charles 29 Sep 1858 & Lewis 29 Aug 1860
Unfortunately not seeing a christening on familysearch for Sarah Wells to confirm whether or not Richard & Ann are her parents
deathHalstead Sep 1869 age 48
Eliza Wells burial 15 Sep 1869 Halstead
https://familysearch.org/ark:/61903/1:1:QJD4-7G491871c https://familysearch.org/pal:/MM9.1.1/KDZB-HKP1881c https://familysearch.org/ark:/61903/1:1:XQZK-BP5death Halstead Mar 1901 age 86
Richard Wells buried 16 Mar 1901 Halstead
https://familysearch.org/ark:/61903/1:1:QJD4-7PXQ