why is miss pross afflicted with 'a fit of the jerks ' when darnay comes to visit ? how many foreshadowing can you find ?

I don't believe this is an illness, but rather a condition brought on by nervousness. The "jerks" are mentioned twice in the novel. Once in regard to Darnay (I believe she's worried about Lucie's suitors), and once again in regard to being in a large group of people.

Forshadowing in which chapter of the novel?

in chapter 6 I think