The sequence of events as shown in the DT version:

(the friends gather at the wake, have lunch)

Biddy O'Brien began to bawl
"Such a nice clean corpse, did you ever see?
"O Tim, mavourneen, why did you die?"
Arragh, hold your gob said Paddy McGhee!

cho:

Then Maggie O'Connor took up the job
"O Biddy," says she, "You're wrong, I'm sure"
Biddy she gave her a belt in the gob
And left her sprawlin' on the floor.
And then the war did soon engage
'Twas woman to woman and man to man,
Shillelagh law was all the rage
And a row and a ruction soon began.

So Biddy O'Brien begins to lament the death, Paddy McGhee tells her to shut up (why? because she's ruining the party by being so morose??), then Maggie O'Connor tells Biddy that she's wrong (about what???) which starts the fight. There seems to be something missing here!!

Bruce, does the John F. Poole text contain anything more? If so, can you post it?