Answer: A. She does not trust Mr. Brympton.
In this excerpt, the speaker states that the gentleman (Mr. Brympton) lost interest in her, and went back to talking to his wife. The speaker then knows that he is not interested in her ("I was not the kind of morsel he was after"). She blames this on the typhoid fever she contracted, therefore, we can assume that the illness changed her appearance. However, she states that she is grateful for this, as it kept gentlemen such as Mr. Brympton away. This shows that the speaker does not trust Mr. Brympton and is glad he is not interested in her anymore.