It actually may not be
kennel cough. Many things can make them
sneeze, from an allergy to something to sniffing a glass that contained an alcoholic beverage. As far as the cough, chihuahuas and other small dogs are commonly afflicted with collapsing tracheas, and palpating the throat is a way to trigger that when looking for it.
I would just keep an eye on her. Kennel cough causes a loud, honking cough, famous for keeping owners awake at night.