Sentence:  "Don't ask me: don't make me talk of it," she answered. "I'm not fit now. I have been cruelly used and cruelly wronged. You will be kinder than ever, if you will walk on fast, and not speak to me. I <WSD>sadly</WSD> want to quiet myself, if I can." 
Meaning of the word marked with <WSD> tags:  Very much (of a desire etc.); dearly; urgently.