Final answer:
Christine mentions Mrs. Daigle in the dialogue to express sympathy for her.
Step-by-step explanation:
In the dialogue, Christine mentions Mrs. Daigle to express sympathy for her. Mrs. Daigle is heartbroken over Claude's death, and Christine understands that this has greatly affected her. By mentioning Mrs. Daigle, Christine is acknowledging her pain and showing empathy towards her.