Unrealistic themes
Little Sister has unrealistic themes, Colleen is a nun in training who has to go back home for one week to sort out her personal issues, and the issues that occur in this movie would take a lot longer than a week to be resolved, if at all.
The movie screams propaganda, it should've been more realistic by having Colleen go home for a month or so, and there's no way any young woman would give up her freedom to become a nun in this day and age.