Final answer:
Constancia responds to Abuela becoming lost in the church with worry and panic, showing her deep concern for her grandmother's safety.
Step-by-step explanation:
When Abuela becomes lost in the church, Constancia has a strong reaction. She becomes very worried and panicked, as seen in the quote "the house'll go next! If I only knew w'ere Bibi was!". This shows her fear and concern for her grandmother's safety. Constancia's reaction is understandable, as she cares deeply for her family and wants to make sure they are safe. She is willing to prioritize their safety over everything else.