I believe that the closest synonym for the word overwhelmed is awestruck. It isn't jubilant, because that means happy. And overwhelmed isn't necessarily happy, it is just a strong emotion. Flattered and gracious just don't fit here.
An indirect characterization is a character in a story wherein his personality is shown through speech, action or appearance. Given the story of each paragraph above, it shows that Cindy's story is an example of indirect characterization.
You should decide to call 911 on a phone.