Is the punishment Miss Strangeworth receives at the end of the story appropriate?

Miss Strangeworth takes great pride in her roses. At the end of the story, when she is unmasked as the author of the poison pen letters, she receives her own letter—telling her that her roses have been destroyed.
This would seem to be a fitting punishment for someone who has destroyed other peoples' lives through her malice. It is also not violent, in the sense that no human being was physically hurt, and yet it sends a strong message. However, it is not really an appropriate punishment, because Miss Strangeworth misses the point completely. As she reads the letter, she begins to "cry silently for the wickedness of the world."
The letter becomes simply another confirmation, ironically, that everyone else in the world is secretly wicked. She doesn't understand that it is her own wickedness that brought this sad fate on her. Despite all that she has done, she still thinks she is pure and an agent of goodness in a fallen world.

It could be said that the punishment that Miss Strangeworth receives is inevitable, if not appropriate. In the small town in which she lives, it seems unlikely that one day she would not be discovered as the author of the hateful letters that so many people have received over the years.
The question of the appropriateness of her punishment is debatable. The destruction of the flowers seems unnecessary to get the point across that her actions are now known by others and unappreciated. In a small town, it would be easy to put the word out that Miss Strangeworth is the judgmental and nasty person who has gone out of her way to hurt others under the cowardly cover of anonymity. If her cover were to be blown, she would likely be ostracized as a natural consequence. Perhaps that would be the appropriate response to her indefensible behavior.

The answer to this question is largely a matter of opinion. However, there's no doubt that there's an element of poetic justice about Miss Strangeworth's comeuppance. If there was ever a case of "what goes around, comes around," then this is it. Miss Strangeworth spends much of her free time writing really nasty poison pen letters to other folks in the town. She genuinely thinks that she's acting with the very best of intentions. After all, she does feel that this town kind of belongs to her, on account of her grandfather building the first house on Pleasant St. As the town's unofficial matriarch, she believes herself to have a deep sense of responsibility for the general moral tone of the place. That's why she writes her letters.
But when Miss Strangeworth receives a threatening letter of her own, she suddenly gets a taste of her own medicine. And, yet, she still doesn't see the harm in what she did. To her, the letter she receives is yet another example of the wickedness of the world, but we get no sense that she's in any way contrite for her own poisonous missives. Despite this particularly nasty case of bad karma, it doesn't seem that Miss Strangeworth has learned her lesson at all. That being the case, it could reasonably be argued that, yes, she did receive an appropriate punishment for her actions, albeit one that no civilized person could possibly condone.