This is an example of dramatic irony because Helena doesn't know that the men who despise her are bewitched, but the public knows it.
When she talks about the companions that detest her, she is referring to the contempt she is receiving from the men who have accompanied her. However, this contempt is not real, as men are bewitched and manipulated to despise her.
Although the reader knows this, Helena does not, and therefore, this is an example of dramatic irony.
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