Reworking or reshaping level of the revision process.
Explanation:
There are basically three processes involved in the revision process. They include;
1. Rethinking or Reseeing: This is the stage whereby the writer evaluates his content and decides to change certain information he has included because they do not accurately project what he has in mind. What is written is changed.
2. Reworking or reshaping: This is the stage where the writer is not satisfied with how the content was written and would be perceived by the reader. He then decides to adjust it so as to improve the clarity. This is the stage the writer is in, in the above described scenario. He adjusts the content to improve clarity for the reader.
3. Editing and Proofreading: The writer corrects typographical errors at this stage.
When you say that someone has lost his head over something it means they have an obsession towards that thing. Liking something too much is a form of obsession. So the feelings projected by Aunt Agatha is a concern that Gussie likes America too much.