I did something similar.I studied the questions and answers for my FAA written tests for my mechanic Airframe and Powerplant certificates back in the early 1980s when I was in vocational school.
Maybe she always wanted a daughter and this was her opportunity .. Or maybe she had a child that reminds her of this girl 🤷🏻♀️.. Or this teacher was this young girl once and wished someone helped her and was there for her Or maybe she’s just sick in the head and is insane & manipulative