The heroine is suspected of suffering from some kind of mental illness. She is really ill (since you clicked in, please don't scold me for this reason). She is precocious and mentally distorted due to the lack of fatherly love. She believes that only "mother" will not leave her... She was 11 years old when the story started.
The psychotic heroine has an unrequited love for Professor Snape (the most likely direction) and will have GB tendencies (which often appear in the heroine's mind)
The heroine defines her feelings for the professor as her attachment to her mother. She may not realize love until later (or she may never realize it)
? The heroine's name is Roslin, first person warning
Purpose: To write something weird that satisfies myself. There is no sweet love, and it probably has nothing to do with the main drama.