Information below is from FAG contributor Grant W. Sullivan;

I have found the following information within Ancestry.com related to the parentage of Ann Clementina Russell. The short story is that she was the the child of an unwed couple. I have not found anything yet that states that her parents were ever married. Her mother was Clementina (Stillwell) Peeler [Russell?] Haines. Clementina was divorced by her 1st husband Richmond Peeler of Arkansas Territory before 1820, because he thought she was having an affair with Land Speculator William Russell. It appears Ann was born sometime after the divorce, but may haven even been conceived AFTER the divorce. Clementina claimed in her Will of 1825, that William Russell was in fact Ann's father, and had agreed to Support Ann.

This is the document from Ancestry.com:
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Taken from “Stillwell Heritage in Arkansas, 1798-1976 by R. W. Dhonau

Clementina, daughter of Joseph Stillwell II and Sarah Winter was born about 1793. She married Richmond Peeler who was a property owner at Arkansas Post. He was also in the legal profession and would travel around the district and hold court to settle claims. He owned not only a dwelling house but also owned the building in which the Arkansas Gazette was first published at Arkansas Post. He was also interested in politics and ran unsuccessfully for political office twice in the early 1820’s. He ran for both Representative and for Senator in the Territorial Legislature but was defeated. Before 1820, Clementina and Mr. Peeler were divorced reportedly as a result of her involvement with Mr. William Russell. Mr. Russell was a land speculator in the state and was closely associated with Clementina’s father, Joseph Stillwell, II. Russell and Stillwell were both included in the Spanish Land Grant No. 2399 with eight other men. As stated in Clementina’s will (drawn up in 1825), her daughter, Ann Clementina Russell, was William Russell’s daughter. Clementina married Benjamin Haines on September 8, 1839. She died March 31, 1848.
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Another document I found in Ancestry.com states the same relationship:
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Clementina Stillwell was born about 1793. She married Richmond Peeler. He was a property owner at Arkansas Post and was in the legal profession. Part of the time, he traveled around the district and held court to settle claims. Besides owning a dwelling house, he also owned the building in which the Arkansas Gazette was first published at Arkansas Post. He ran for public office in the Territorial Legislature in the early 1820's. In both elections for Representative and Senator, he lost.
He and Clementina were the parents of two sons. They were divorced before 1820, because of her involvement with William Russell, a land speculator for the state. Russell had been closely associated with Joseph Stillwell, II, father of Clementina and both had been included in the Spanish Land Grant No. 2399 with eight other men. As stated in the will of Clementina Stillwell, Russell was the father of her daughter, Ann Clementina Russell. He provided for his daughter's education and deeded her a large tract of land and a slave.
Clementina was later married to Benjamin Haines on 8 September 1839. She died on 31 March 1848.
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Ann is listed in the Will of Clementina Stillwell as Clememtina's daughter by William Russell, who was responsible for Ann's support, including having bought a 4-poster bed for Ann, which, along with Ann, were to be delivered to William upon Clementina's death.

Clemintina died AFTER Ann married Thomas Allen.