Jersey marriage records at IRAD: 1839–1842; 1877–1900, Use LDS Family Search.
From Toby Williams at various times via Email:

Searching for information about parents/siblings/children of Jane Billings, born 2 March 1810, Tennessee. She married Abner Clark Sep 1841 They lived in Pike County, IL and later moved to Logan County, IL, where she lived with her son Silas Clark until her death 2 March 1883.
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I have not looked at the 1855 Census. I have a note that says she was single with children and she moved after the state census of 1855. I don't know where I got this information so it must be confirmed.
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From Toby:
- I have confirmed two sisters of Mary Louise Hampton, Catherine and Ann. Catherine married Ezekiel Fuller in Jersey County in 1852, and witnessed Jane Clark's transaction selling the Ralls County property. The Fullers lived almost right next to the Williams and the
Edwards in Jerseyville. This suggests that the Hamptons/Clarks moved to Jerseyvile sometime in about 1852.
- Ann Hampton married Lemuel Parrish in 1853 - who was living next door to Jordan Hampton (and is literally the next census entry). This suggests that due to their age (under 18), these girls would have needed permission to marry, and these permissions may very well be in Jersey County.

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Jane was living with her son, Silas, during the 1880 Census of Logan County. See his notes for details. Who ever replied to the Census taker believed she was born in KY and so were both of her parents.
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C-10-26
Martha Jane Clark
Died March 2, 1883
Aged 73y