In my play I do have Charlotte allude to how much she disliked being a governess, but I saw this letter to Ellen Hussey in which Charlotte wrote:
I am miserable when I allow myself to dwell on the necessity of spending my life as a Governess. The chief requisite for that station seems to me to be the power of taking things easily as they come and of making oneself comfortable and at home wherever we may chance to be – qualities in which all our family are singularly deficient.This must go into my play.