and is so terribly sad and scared.

I don't understand Edmund's statements when she tells him how she hates the idea and he tries to console her:

“It has everything else in its favour. My aunt is acting like a sensible woman in wishing for you. She is choosing a friend and companion exactly where she ought, and I am glad her love of money does not interfere. You will be what you ought to be to her. I hope it does not distress you very much, Fanny?”

I find it interesting that nobody else in the household seems to see how Mrs. Norris treats Fanny.