Step 1: Fear of losing a loved one. The poet fears losing her mother and expresses this through the observation of her physical decline. This conveys a universal fear of losing one's parents.
Step 2: The passage of time. The poem highlights the passing of time and how it affects people, especially parents, who eventually age and become frail.
Step 3: Emotional connection. The deep emotional bond between the poet and her mother is emphasized, showcasing the love and concern the poet feels.
Final Answer: \[ \boxed{\text{The poem reflects the poet's concern for her aging mother, emphasizing mortality, love, and the passage of time.}} \]