Belatedly checked IGI and found

Mary Gell m. John Quiggin 15 Dec 1765 KM extracted

so Mary Quiggin who married Patrick Corjeage could perhaps have been a widow, although it's not mentioned in the marriage record.

And now I see, Frances, in your Will Summaries:

1783-2 E w QUIGGIN John ballony; d 9 Jun;
dau mary; wife alive execx; wm gell gfa guardian; 1790 james oates h/o mary acks from Patrick Cojeage h/o execx;

(which I hadn't spotted before as I searched with 'Cord/g/j' rather than 'Co').

So thank you once again.