Charlotte Brontë remains the primary source of information about Emily, although as an elder sister, writing publicly about her only shortly after her death, she is considered by certain scholars not to be a neutral witness. Stevie Davies believes that there is what might be called Charlotte's smoke-screen and argues that Emily evidently shocked her, to the point where she may even have doubted her sister's sanity. After Emily's death, Charlotte rewrote her character, history and even poems on a more acceptable (to her and the bourgeois reading public) model. Biographer Claire O'Callaghan suggests that the trajectory of Brontë’s legacy was altered significantly by Elizabeth Gaskell’s biography of Charlotte, concerning not only because Gaskell did not visit Haworth until after Emily’s death, but also because Gaskell admits to disliking what she did know of Emily in her biography of Charlotte. As O'Callaghan and others have noted, Charlotte was Gaskell's primary source of information on Emily's life and may have exaggerated or fabricated Emily’s frailty and shyness to cast herself in the role of maternal saviour.