Ann Wells was her husbands first cousin, according to Alexander Greenwood's book.  Not found the link between her father Edward and Charles' mother Sarah yet.  Brother and sister presumably?  The fact is seeming more and more doubtful, as Sarah Wells' father was John (not Paul or previously Edward as AAG had it) and came from Great Milton and no relationship has been found to the Wallingford Wellses.
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She was given a lagacy in the will of her grandfather Edward Wells:

  “ITEM I give and bequeathe to my granddaughters ANNE and SARAH, the daughters of my said son EDWARD WELLS, the legacy or sum of £50 a piece”

This is the only indicator of the relationship of Ann to her father and grandfather.
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Her burial transcribed by Berks FHS:

First name(s)  Ann
Last name      Greenwood
Residence      All Hallows Parish
Death year     1808
Burial year    1808
Burial date    29 Jun 1808
Church         St Mary the More
Place          Wallingford
County         Berkshire
Country        England
Record set     Berkshire Burial Index

There were three Ann Greenwood burials from 1785 to 1817 and I have chosen the one that corresponds with Alex Greenwoods book.  It is not guaranteed to be right.  There may be a family bible or newspaper or grave inscription to confirm his ascription.
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Her will, in the PRO and of which I have a copy, was dated 21 Feb 1888, leaving her estate to her six daughters and appointing as executor her brother John Wells who in fact died before his sister.  Accodingly Ann's daughter Mary was givien the power to admisinster the estate on the 30th July 1808.

She died 20 years after her husband and only mentioned him in her will by calling herself ‘widow’.
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In the will she lists:

Her daughter Sarah Greenwood,
Her daughter Mary Greenwood,
Her daughter Ann Greenwood
Her daughter Phillis Greenwood,
Her daughter Elizabeth Greenwood,
Her daughter Priscilla Greenwood.
Her brother John Wells of Wallingford to be executor.
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Their marriage transcript by Berks FHS:

First name(s)           Anne
Last name               Wells
Birth year              -
Marital status          spinster
Residence               of this Parish
Marriage year           1765
Marriage date           26 Sep 1765
Church                  St Leonard
Place                   Wallingford
County                  Berkshire
Country                 England
Spouse's first name(s)  Charles
Spouse's last name      Greenwood
Spouse's occupation     Gent.
Spouse's residence      All Hallows, Wallingford
Signed                  Signed: Ann WELLS
Licence or banns        Licence
Witnesses               Edwd. WELLS; Sarah WELLS
Additional information  [Officiating Minister] John SCOOLT, Rector
Record set              Berkshire Marriages Index
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