The first commitment record was found while searching for any record that might give a clue to Elizabeth Conway's birth year and nativity. It is the first record I've found of a prior commitment that was not referenced in a subsequent commitment.
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Vol.2 p.456 Commitment #702 - Mrs. Elizabeth Conway. Committed by J. T. Landrum Co. Judge of Shasta. Is a native of Kentucky, married & has 5 children. Been Insane 7 months. Cause of insanity child bearing. Has no property. Was comt'd some 5 weeks but was taken care of by her friends. Admitted Sept. 10th 1859. Discharged Aug 4th/60.
[Commitment Reg. Vols.1&2 1862-1870 p.456]
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Vol.3 p.91 - Elizabeth Conway. Committed by C. C. Bush Judge of Shasta County January 12th 1863. Age not stated, native of the United States. Resides in Shasta County. Occupation housewife, is married. Has resided in this State over ten years. Previous habits regular, cause of insanity family difficulties. Has been affected eight years. Class of insanity, mild. Present symptoms constantly followed by Spirits and phantoms counciling evil deeds, with a disposition to do murder.
Admitted January 29th 1863. Has no property.
The above named Elizabeth Conway brought with her to the Asylum a male child about two years old, which has been placed with M. Hilyard living on the Sonora road about five miles East of Stockton. Elizabeth Conway Died March 13th 1865.
[Commitment Reg. Vols. 3&4 1862-1870 p.91]

- California State Hospital Records, 1856-1923. Stockton State Hospital, Commitment Registers. [Ancestry.com]
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Census Notes:

1850 Fairfield, Jackson County, Iowa
Wm Conway 43 farmer Ohio
Elizabeth --- 27 Kentucky
Thomas ---- 15 Ohio
James ------ 14 Ohio
Josephine -- 11 Ohio
Eliza --------- 7 Missouri
Winfield ----- 2 Iowa
Nancy ------- 1 Iowa

1860 Shasta P. O. & County, California
William Conway 54 Farmer 300/1000 Kentucky
-------- Thomas 25 Miner Ohio
---------- James 23 Laborer "
------ Josephine 20 ----- Iowa
------------ Eliza 17 ----- "
-------- Winfield 13 ------ "
------------ Jane 11 ------ "
------ Margarette 5 ------ California
-------- Frederick 3 ------ "
----------- Robert 1 ------ "