Also in the 1851 Census and the next entry over the page from Susan COOK,

Bridge Street, Newent
Mary Ann COOK, Wife, Mar, 29, Wife of coal and timber merchant, b Stafford, Holly Hall.
Comfort LEWIS, Visitor, Un, ??, , b. Glos. Newent

If this is her William COOK is evidently absent on Census night.

I can’t track Holly Hall as such but there is a Holly Bush Hall in Staffordshire just north of Newborough.