how is Bertha a doggelganger to Jane

While Jane navigates through her emotional ordeals, Bertha does the opposite. As the representation of the classic Gothic figure of "The Madwoman in the Attic," Bertha is both pitiable and terrifying and supports Bronte's critique of gender inequalities and Victorian marriage during the period.Jane might have ended up like Bertha except she is able to become more self-aware and independent.