score:3
No, it was not the first.
Sacramento Transcript, Volume 2, Number 29, 27 November 1850:
Divorces in California.β If there is any one spot on earth where less of this kind of thing should take place than another, that place is California. Females have heretofore been so scarce that we should think wives would be more highly esteemed by their husbands, and more closely endeared, so as to render an application for a divorce a novel affair. We observe that in San Francisco, on Saturday, the Superior Court granted a divorce to Mary Dyson from her husband, James Dyson, for various causes. George R. Parburt, Esq., for Plaintiff.