It is clear that narrator's decision to fake an injury affects the plot in that: "She feels so badly about her deception that she confesses to her coach"
<h3>Who is a narrator?</h3>
A narrator is the person via whose perspective a story is being told. In this case the narrator is involved in a deception which she ultimately confesses and gains a relief of conscience.
The textual evidence that supports this is:
"I am so sorry,' I say. 'I pretended I turned my ankle because I was embarrassed. I was just so scared, so nervous.' I'll explain everything"
This answer is showing you just the way her eyelids wavered making you a mental picture of just the way they did, and how they "let in streamers of blue grey light like tissue paper over her eyes"
