I can see the headlines now. Harriet, not contented with murdering her ex-lover, is now manipulating young undergraduates into committing theft for her through her sexual wiles. Police are investigating her whereabouts in connection with several recent jewel thefts.

Possibly the Proctor was too embarrassed by the whole thing to mention it. But if the dons do know, it would add force to Miss Hillyard and Annie's feelings that Harriet is messing Peter around.