Suspicion

I interviewed an intern. A leetcode easy question. What triggered me immediately was she immediately mentioned a specific optimal ds before I thought she could understand the question. I probed her understanding of the question but she couldn't define the input of the problem. Then I let her write code. It was perfect. A leetcode easy, but still perfect. My suspicion rised. I told her to do reverse refactoring. From perfect to the most naive solution. I asked her to use simple array instead of the perfect ds. Then signs started to show. She couldn't understand her own perfect code. Broke the interface. Mixing up between input and init fields. Then I asked why she chose the perfect ds for this question, and give me alternatives, pros and cons. She started to give ds that don't fit, couldn't state time complexity of alternatives, even the most simple array. Twist: I wrote review to recruiter stating that I high suspected she uses AI code generator during the interview. After submitting it, I realized my director referred her. I'm so dead