Answer:
She is angered by the arrival of Union soldiers in her Confederate state.
Step-by-step explanation:
The passage shows the author's anxiety, distress, and anger at the thought of the Union soldiers' arrival. She sees them as a threat, as dangerous people who will come to destroy her city and its inhabitants, which she deeply cherishes, hence her determination to leave before the “Yankees” come and pick her bones, in other words, before ends up dead in that place.