Answer: Scaffolding
Step-by-step explanation:
Scaffolding is defined as the teaching technique in which a trainer, teacher or any instructor instructs the steps for solving any issue or performing function and then withdraws themselves .They let the student practice the problem solving on their own and helps only when they require support.
According to the question, Tracey's mother is using scaffolding as she is teaching her how puzzle solving should be done and then lets Tracey perform puzzle solving.She is proving Tracey hints to solve the puzzle when Tracey needs any support.