Looking for words and source of a song whose chorus goes:

Now she's gone, let her go
Let her sink or let her swim
Her love for me is gone like a swallow on the wind
She's gone across the ocean
To do the best she can
And I hope that she finds favor
In some far distant land

I heard this on a tape of Jim Kweskin that Joe Loop made at the Attic in Boulder, Colorado, c. 1962.