... gives me the shivers. Fanny does not often border to resenment, but when she does she is a bit like Hamlet :-)

I think the passage you picked up is a most interesting one as regards character developement. Here is Fanny, who in the whole course of the book has been the peace-maker, hesitating to speak, unwilling to make hasty judgements etc etc. Here she blurts it al out together, it's like a hurricane. Edmund and Mary must have tried her nerves very, very, VERY much :-). However, I find interesting that, even now, she tries to be candid in her judgement of Miss Crawford. She uses expressions like "perhaps" and "likely" and allows for possibilities at to who initiated the corruption.

The other thing that strikes me is the intensity of her despair as to his supposed approaching wedding. "It is an attachment to govern his whole life. Accepted or refused, his heart is wedded to her forever." I say, such drama! Doesn't it remind you of another Heroine Who Must Not Be Named Because It's Austenuations Territoty?