Final answer:
Mrs. Allerton's lack of a good feeling about Joanna is not elaborated in the provided text, but such sentiments in literature often arise from subtle character interactions and dynamics.
Step-by-step explanation:
The lack of a good feeling about Joanna mentioned by Mrs. Allerton is not explicitly detailed in the excerpts provided. However, it can be inferred that Mrs. Allerton's unease might stem from a combination of Joanna's circumstances, interaction with her surroundings, and possibly her demeanor, which may have sparked a sense of uneasiness or suspicion in Mrs. Allerton. Literature often employs nuanced character interactions and the reactions of characters like Mrs. Allerton to subtly reveal deeper layers of a story and its individuals. Without more context or specific text related to Mrs. Allerton's feelings about Joanna, we can only conjecture based on what's been shared about character dynamics in the passages you provided. These dynamics build an atmosphere and influence the reader's perception of the characters, which may include an undefined sense of foreboding or concern that Mrs. Allerton feels towards Joanna.