Could this get any more confusing? – There are two Mary Shepherds.
One married a Cuthbert Sharp in 1767.
The other married Luke Hood in 1770, and he died in 1771.
Burials, Hartlepool District, Church: St. Hilda
3 Aug 1771 Luke Hood, drown'd 31 July, fisherman
She went on to marry Paul Sharp, another fisherman, as you have pointed out. The tree that I referred to in my earlier post does seem to know about this, but referred to Paul Sharp's wife by her maiden name.