I wrote about this in "Guerrilla Warfare in Civil War Missouri, Vol. II, 1863," but all I really have are pieces of the story. My sources include:
--Joanne Chiles Eakin, "MO POWs" [short version of a long title], publ. by author in Independence, 1995, White entries;
--U.S. Gov't, "O.R." series 2, vol. 6, p. 381;
--U.S. Gov't, "1860 Missouri Census" of the Dr. Ferrel C. White family of St. Francois Twp. of near Greenville, central Wayne County;
--Joanne Chiles Eakin, "Civil War Military Prisoners Sent to Missouri State Penitentiary," publ. by author in Independence, 1995, page 3.

Basically, what the "O.R." says is that Union BG Fisk on 15 October 1864 ordered the three White sisters [Arabella, Martha Evaline, and Sarah Pauline] arrested evidently for cheering for the Confederacy in a public place. He ordered the arresting official to "let them be well treated" but Fisk intended that all three young women be banished to the South. Since I have nothing more about Arabella and Martha Evaline, I wonder if they were then banished to the South, in accordance with General Fisk's intent. As you will see, Pauline must have committed some other wrong, because she was tried by a military commission and sentenced to prison for the duration of the war.

All that Eakin's "MO POWs" says is that Pauline (shown in the 1860 census as "Sarah Pauline White") White, "female of Wayne County, MO" was sent to either Gratiot Street or Myrtle Street Prison in St. Louis, with the remark that she was later sent to the MO State Penitentiary [at Jefferson City] as of 22 August 1864. This is taken from the prison ledger entries kept by the Union military clerk.

Eakin's smaller booklet has more of the story. It states "Pauline White, 20 years old, born in Tennessee, black hair, black eyes, fair complexion, military prisoner from St. Louis, sentence 'during the war' by military commission, received 24 August 1864. Remarks: Pardoned by President Johnson 23 Jun 1865."

I hope this helps.

Bruce Nichols