The Famine is probably just a red herring so far as this song is concerned, since it isn't mentioned in any version found in tradition, so far as I can tell; marrying for land or money was not unusual at any time, or in any country.

Kennedy's Folksongs of Britain and Ireland has a version from Michael Gallagher of Beleek in Fermanagh, "The Deluded Lover", which has that final verse; the notes add:

"This fine song...recorded from members of the Tunney family...was also sung by Mary McGarvey of Donegal, where it was entitled The Briar and the Rose."

The final verse of that version is then quoted:

But if the Queen would call off her men
Through England, Ireland, France and Spain
And take every man from his wedded woman
Sure, the Lord might send me my true-love again.

"Now she hopes that the Queen will not only recall her soldiers but, in so doing, will also call them away from women they have married while abroad."

This may be an over-convoluted explanation, but it presumably could be something on those lines.  It doesn't really make any difference whether the man or the woman is considered to be speaking at that point.

Malcolm