She was a teacher in name only. After Arabella Donovan flagged her as a person of interest, Ron Cole and his team had already made arrangements. They found an excuse to transfer her from her teaching post to another department, eliminating any chance of her interacting with students.
This also served as a reminder for Arabella Donovan. Having anticipated the current situation, but not daring to alert the targets and risk the source of infection spreading to unknown individuals, Ron Cole hadn't forcefully cut off their contact with the outside world. Instead, he had chosen a more subtle approach, guiding them into a prepared quarantine environment without arousing their suspicion.
With the wealthy heir's sudden death, the group was brought under control almost immediately, their contact with the outside world completely severed.
