Final answer:
Based on the given information, we cannot determine if Mina was very concerned about Lucy's sleepwalking.
Step-by-step explanation:
This question is asking whether Mina was very concerned about Lucy's frequent sleepwalking. To determine if this statement is true or false, we can refer to the given information. However, the passage provided does not mention Mina, Lucy, or sleepwalking. Therefore, we cannot definitively determine if Mina was very concerned about Lucy's sleepwalking based on the given information.