How did Jane Eyre recognize the gypsy?

Jane Eyre did not recognize the "gypsy" in the traditional sense. The character you are likely referring to is Rochester's first wife, Bertha Mason, who is presented as an unstable and "mad" woman, often described as wild and unpredictable.

The term "gypsy" is often used to refer to the Romani people, but it's important to note that this is a term that is deeply rooted in prejudice and can be offensive.

Jane never explicitly identifies Bertha as a "gypsy". However, some interpretations suggest that Bertha's wildness and the fact that she is hidden away in the attic are used by Rochester to fuel a comparison with a stereotypical "gypsy" figure.

It's important to remember that the portrayal of Bertha in the novel is problematic and reflects the racist and sexist attitudes of the time. While Jane might not have explicitly recognized Bertha as a "gypsy", the way Bertha is described and treated by others in the story reflects the biases of the Victorian era.