Final answer:
Mrs. Tracey was acting disinterested during class, as evidenced by her angry reaction to a question and her restless behavior. This suggests that she was not fully engaged or interested in the class.
Step-by-step explanation:
Mrs. Tracey was acting disinterested during class. In the provided evidence, she seemed angry when the student asked her a question and returned with irritation to some legal points. Additionally, she was described as being in a condition of feverish excitability. These behaviors suggest that she was not fully engaged or interested in the class.