The narrator's use of the adjective "ecstatically" in the line " 'Do they

miss me?' she cried ecstatically" conveys that:

The use of the word "ecstatically" in that line conveys that she is happy that who ever "they" is cares about her and is thinking about.

Explanation:

Imagine you left school for a week, and your friend texts and says "Your crush said hi" Then you would say "Does he miss me?" all excited, cus that would mean your crush is thinking about you.