The notes from the High Level Ranters' The Bonnie Pit Laddie say,

The pitman's wife mentions in the last verse [not included above] that she has been turned out of her home.

The "not included above" refers to the set at My Songbook (http://mysongbook.de/msb/songs/d/dialogue.html#notelink), which does include the two verses I've added above, which are on that site, and also included by A.L. Lloyd.

Any clues at all about that additional verse?

~ Becky