Final answer:
Mrs. Mallory feels uncomfortable during lunch in Dry Fork due to restlessness, irritation, and a state of feverish excitability.
Step-by-step explanation:
Mrs. Mallory feels uncomfortable during lunch in Dry Fork because she is restless, easily irritated, and in a state of feverish excitability.
These feelings might be due to the unfamiliar environment or some underlying issue that is causing her discomfort.
It is also mentioned that she is sensitive and impressionable, which could contribute to her unease during lunch.