More important, she traveled from where?
But where she is from is also important since it's proven that certain groups of immigrants have higher rates of diseases endemic to their place of origin.
All you got to do in Cali to get exposed to the plague is to be too close to a chipmunk.
Check out this pdf about plague in California. You will see that huge parts of the state have rodent populations that carry plague. Many of these areas are near and include big cities.
http://sagehen.ucnrs.org/Documents/visitors/vectors/plague.pdf
n the southwestern United States, rock squirrel fleas are the most common source of infection in people. In the Pacific states, California ground squirrel fleas are the most common source. Many other types of rodents -- including other ground squirrels, prairie dogs, chipmunks, wood rats, wild mice, and voles -- suffer plague outbreaks and are occasional sources of human infection. Domesticates can be infected by fleas or by eating infected wild rodents and can be a direct source of infection to people. Dogs rarely suffer severe illness and have yet to be shown to be sources of infection for humans.