Sentence:  Though Mrs Honour was principally attached to her own interest, she was not without some little attachment to Sophia. ... She no sooner therefore heard a piece of news, which she imagined to be of great importance to her mistress, than, quite forgetting the anger which she had conceived two days before, at her unpleasant <WSD>dismission</WSD> from Sophia's presence, she ran hastily to inform her of the news. 
Meaning of the word marked with <WSD> tags:  The act of dismissing or sending away (someone).