Final answer:
The evidence from the text that supports the conclusion that Alana followed her mother's advice is found in the sentence where the Student took notes after Alana finished singing.
Step-by-step explanation:
The evidence from the text that supports the conclusion that Alana followed her mother's advice to learn how to use her voice like an instrument is found in the sentence: "When she had finished her song the Student got up, and pulled a note-book and a lead-pencil out of his pocket." This sentence suggests that Alana's singing was so impressive that it prompted the Student to take notes, indicating that Alana's voice was treated like an instrument.