Final answer:
Malala thought her friend Safina had taken her Barbie doll, an incident that showcased the challenges of childhood friendships.
Step-by-step explanation:
Malala believed that her friend Safina had stolen her Barbie doll. This incident is mentioned in her memoir, where she illustrates issues of trust and friendship. The options given seem to suggest different attitudes towards a doll; however, the correct answer is that Malala thought Safina had taken her Barbie doll without permission. This scenario served to highlight the complex relationships and moral dilemmas children face, and it is an anecdote that reflects on the personal history of the young Nobel laureate.