There are a few Mary Beales of the right age around that area on the 1851 census, but this one seems to have had a husband named John because there is a Phillis Beale baptism 6 Jul 1823 Wyke Regis, Dorset, daughter of John and Mary:
https://www.ancestry.co.uk/imageview...ce&pId=5575640
6 East Row, Weymouth, Dorset
Mary Beale Head Widow 66 Monthly Nurse Dorset Portland
Philis Do Daur U 27 Laundress Do Weymo
Mary Ann Do Daur U 25 Plain Worker Do Do
James Martin Grandson 8 Scholar Do Do.
There are a few Jane Strouds. This one is at 15 West Street:
https://www.ancestry.co.uk/imageview...ce&pId=5572823
and another at 17 West Street:
https://www.ancestry.co.uk/imageview...ce&pId=5572834