Given that, the poem is a success because her intent is executed successfully. But some intentions are misguided. When the outcome precisely demonstrates a misguided intent, the outcome is a misguided success. Or a successful misguidance.

i.e., if you write a poem using too many words in order to demonstrate the effect of too many words, you may be successful in demonstrating the effect, but yours is still a poem with too many words.

i.e., not all object lessons are good ideas.