Step 1: Understanding the Concept:
This question refers to the story 'Two Horizons'. The story unfolds through letters between a mother and daughter, highlighting their contrasting lives and perspectives.
Step 2: Detailed Explanation:
In one of her letters, the daughter confides in her mother about the toll her responsibilities and struggles have taken on her. She laments that she has lost her former quickness—the liveliness and energy that once characterized her spirit.
This expression reflects her deep sense of exhaustion and how burdens of life have slowed her vitality, symbolizing a fading of youthful vigor and enthusiasm.
Step 3: Final Answer:
The daughter in her letter says that she has lost her quickness.