We can actually see that the following point in the passage shows where the author begins a flashback: It all started three weeks ago when Lillian was at Skye's house and Skye mentioned she played the guitar.
<h3>What is flashback?</h3>
Flashback actually refers to a scene in a story or movie that takes the readers or viewers back to an event that happened in the past. Flashback helps the reader or audience to know certain events that took place which weren't visible in the story.
Thus, we see that the author beginning the selected sentence with "It all started three weeks ago,..."
This actually shows it is a flashback.
Learn more about flashback on brainly.com/question/4072650
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