The 1841 Census (in Ancestry.co.uk) has:
Etnam Street, Leominster, Herefordshire
Anna WELLS, aged 49, Ind [Independent], N [not born in Herefordshire]
Harriet WRIGHT, aged 12, FS [Female Servant], N [not born in Herefordshire]
Looks like Harriet may have inherited the house from her aunt. I haven't been able to trace Ann WELLS or Harriet WRIGHT/TEWSLEY in any other Censuses yet.
Thanks for that find Gasometer, I had a different Harriette Wright age 15 living in St.Stephen, Norwich in 1841. Later in 1851 Harriett age 23 is home in Swanton Morley, daughter of William & Mary Wright. In 1861 she is a school mistress living at Hellesdon, Norwich.
On 1861 census I've found Anna Lewis, widow age 69 born Ringland, Norfolk living in Etnam Street, Leominster, a landed proprietress. Seems Anna Wells, daughter of Samuel Wright, farmer married David Lewis, a baptist minister from Wales in Birmingham, St.Phillips on 12 Oct 1842 with Harriet Wright being one of the witnesses. On 1851 census living in Etnam Street Leominster is David Lewis age 57 & wife Hannah age 60, Annuitant born Ringland, Norfolk. David Lewis has a death index in Dec 1859 Leominster and there is also a death index for Anna Lewis in Leominster in June 1873 age 84, but yet to find her on the 1871 census.
Ancestry's Probate Calendar has an entry for her; she died 22 April 1873 at Leominster; will proved by Harriette Wright of Leominster, spinster, the niece & one of the exectruxes. I might just have to get copy of that will.
Prior to that Anna Wright married first William Sheen at Leominster on 2 Feb 1828. After William died (don't know when) as Anna Sheen she next married Joseph Wells at Leominster on 24 Jun 1834, he dies Sept qtr 1837.... Lastly she marries David Lewis.
So the monument raised to her mother Elizabeth Wright who died in 1820 must have been done by her as Ann Wells, between 1834 & 1842.
Regards
John