To find examples of Miss Strangeworth being evil, look towards the end of the story when she is composing her next round of poison pen letters. Miss Strangeworth shows her darker side, for instance, by writing a letter to Mrs Crane which refers to their "idiot baby." Similarly, she also composes a letter to Mrs Harper in which she hints that Mr Harper is having an affair:
"Is the wife really always the last one to know?"
These two examples are particularly evil because earlier in the story, Miss Strangeworth meets Mrs Crane and Mrs Harper in town and acts friendly and sympathetic towards them.
Finally, Miss Strangeworth composes another letter, this time to Mrs Foster who is due to have an operation. In the letter, Strangeworth suggests that doctors routinely make mistakes and that her nephew might encourage the doctor to do so:
"Would Dr. Burns get his fee and a little extra from that nephew of yours?"