I don’t know if this will help or if you already have this information. My fourth great-grandmother was Ellen Mulloy born in 1788 in Trepassey. Her father was Patrick Mulloy born in Wexford, Ireland and died in Trepassey.

Ellen was one of seven children born between 1755 and 1790. The oldest five were male, William, Edward, Andrew, Lawrence and Patrick. The Mary you are looking for may be descended from one of the five.