While this is addressed to rintrah who was kind enough to point me to the source of the idea, the question is general enough to solicit the reader.
Jane Eyre may be, and probably has been, interpreted from the view of Marxism as set in the period of Industrial Revolution or Freudian analysis of sexual repression or the cultural milieu of Paris where Rochester sought relief from Thornsfield and certainly it is the cornerstone of Victorian women studies, specifically of contemporary Feminist academic literature. The problem in my view is that to restrict the novel to a narrow spectrum, especially of an idealogical bias, is to throttle Charlotte's imagination.
Marxism, Freudian analysis, as many 'isms', have whithered as branches of explanations of human conduct. While Feminism is yet current, it seems that it may also be viewed as an 'isim' of the 20th. century. I would suggest that as difficult as it may be Jane Eyre has to be viewed from a limiting perspective of the Victorian age. Charlotte Bronte certainly was a woman of that age and her intellect and emotions were formed by the limits of that age.
A definitive understanding of Jane Eyre may be fond delusion, or only approachable through poetry or music, forms of emotional rather than cognitive comprehension.