I found this song "The Gal in the Cabbage Line" at American Memory. It's a parody on "Dandy Jim from Caroline" which has the same melody as "The Prettiest Gal in the County O."

It seems this is the likely the original lyric source for source for the "The Prettiest Gal in the County O."

Any thoughts? Here it is:

The gal in the cabbage line.
H. De Marsan, Publisher, 60 Chatham St., N. Y. [n. d.]
IMPRINT: New York, New York: H. De Marsan
NOTES: A parody on "Dandy Jim from Caroline."
SHELF LOCATION: American Songs and Ballads, Series 1, Volume 1

LYRICS: THE GAL IN THE CABBAGE LINE
A Parody on "Dandy Jim from Caroline."

My darling Jane, I'd have you know,
Is the beauty of the city, oh,
She doesn't dress so very fine,
But she's the darling of the cabbage line.

For my old Mommy told me, oh,
I was the best looking gal in the city, oh,
I looked in her face, I found it so,
Just as my Mommy told me, oh!

Every morning early, oh,
You'll find her in the market, oh,
The cabbages she sells are fine,
For she is a bully in the cabbage line.

My old Mommy told me, oh, &c.

I loved her for her virtues, oh,
I'd married her but for butcher Joe,
But butcher Joe he beat my time,
He stole this gal in the cabbage line.

My old Mommy told me, oh, &c.

To Joe a challenge I did write,
He said he'd show me a fist fight,
He'd bung my eye up so prime,
To avenge this gal in the cabbage line.

My old Mommy told me, oh, &c.

At the back of Moyamensing prison.
We met, he took me by the wizen,
His second said I couldn't shine,
'Twas this female in the cabbage line.

My old Mommy told me, oh, &c.

The constables they grabbed us three,
Deprived us of our liberty,
They locked us up in no time,
This comes of being in the cabbage line.

My old Mommy told me, oh, &c.

Moral.

Now city boys a warning take,
Or you'll repent when it's too late,
In prison I am for no crime,
But for loving in the cabbage line.

My old Mommy told me, oh, &c.