Sentence:  “Mrs. Yule's <WSD>chagrin</WSD> and horror at what she called her son's base ingratitude knew no bounds&thinsp;; at first it was even thought that she would never get over it. [...]" 
Meaning of the word marked with <WSD> tags:  Distress of mind caused by a failure of aims or plans, want of appreciation, mistakes etc; vexation or mortification.