Neurobiological
It is hypothesized that depletion of monoamines transmitters cause emotions such as sadness and guilt and can lead to psychiatric disorders such as depression. Thus, it is probably that due to a depletion of monoamines and other biologic functions within the brain, Mrs. B is feeling sad and lonely two of her loved ones have left her. These outside events have somehow triggered neurotransmitters in her body to make her experience such feelings as sadness and loneliness.
Humanistic
The humanistic perspective is based on free will and that people are in control of their own behavior and feelings. Thus, Mrs. B is consciously always thinking about the departure of her two loves ones and because of this constant focus on such unpleasant memories, she is feeling sad and lonely all the time. She desires for them to be with her but her wishes are not fulfilled, also making her feel sad and lonely. However, if she were to focus less on these unpleasant memories and more on other things, such as her students, she would feel happier and more uplifted.
Psychodynamic
Mrs. B may have experienced the departure of people that she was close to before in her childhood, such as close friends or relatives. Thus, when two more of her loved ones leave her she feels sad and lonely as before. The reason she felt so lonely after he child and father left her was because she was very close to them and all of a sudden, that close connection was broken when they left. So when she avoids creating more interactive and fun lessons for her students, she may actually be unconsciously avoiding developing closer relationships with her students so she does not feel hurt as she does now when they leave her and a new batch of students takes their place.
Behavioral
It is obvious that Mrs. B is feeling sad because the recent events of her child leaving for college and her father’s death. But when she sees her students in the classroom, her students’ faces may serve as a stimulus rousing memories of her own child that recently left her. This stimulus would then make her feel sad, just as when she felt sad when her child left for college, and prevent her from focusing on making lessons that are more creative and fun since she is wallowing in her own sadness while seeing their faces.
Cognitive
Mrs. B may interpret the departure of her of two loved one as something that was her fault. She may reason that she somehow pushed her father and child away, perhaps through lack of nurture and not spending enough time with them, and thus, they left her. This blame she has put on herself make her feel guilty, lonely and sad. Also, this interpretation of these recent events has also transferred to the classroom where she reasons that she might be to blamed for not caring enough for her students and thus feels less motivated to create fun and creative lesson plans.