What strange questions. This must be a very advanced book; I don't think many native speakers would get the answers "right".
I would have put "loquacious" and "mutinous", which fits better than the suggested answer. Certainly "mutinous" is just as good as "indelicate", since we don't know what her behaviour was, except that, by implication, it was unseemly.
"Agog". It's not a word I use, but "excitement" doesn't necessarily imply something positive. For example, if you started arguing with me and becoming heated, I might say, "OK, you don't need to get excited."
Student or Learner