The scenario described in the case study suggests a weak Mesosystem.
The Mesosystem refers to the interconnections and interactions between different microsystems in a person's life, such as family, school, and peers. In this case, there seems to be a lack of communication and cooperation among Laurie's mother, her English teacher, and her grandmother regarding the academic pressures Laurie is facing. This absence of collaboration and support among these important figures in her life signifies a weak Mesosystem, as these connections can have a significant impact on a student's well-being and academic performance.
In contrast, the Microsystem refers to the immediate environment (like her family and school), the Exosystem involves social settings that do not directly affect the individual but still influence them (like parental work schedules), and the Chronosystem pertains to the patterning of environmental events and transitions over the life course.