Somehow, during the course of a busy day, a bottle had gone missing from the surgery. The contents, in the wrong hands, could be highly dangerous and it was clear that somebody must have taken it. What was she to do? Should she report it to the police? She was reluctant because, inevitably, it would make her look foolish and irresponsible.
Dr Redwing shared with Mary (why?) that a bottle of poison (key element to any apothecary's stash) had gone missing. If she wouldn't tell the police why would she tell Mary?