Some one who knew her by sight had chanced to see her in California and had noted the wedding ring, hence the "unsubstantiated rumor" of her marriage in San Francisco, a rumor which Nancy half frantic over her husband's desperate illness was the only person who was in a position to explain.
The rumor was a truth.
Rumors of conspiracies, filibustering expeditions, clandestine introductions of arms, and attempts at insurrection were the order of the day.