Scarlet Pimpernel, writing homework help: Getting Involved, questions 14,15

Getting Involved, questions 14,15
14. What do we learn about Marguerite St. Just, now Lady Blakeney? Why does the Comtesse detest her?
15. After hearing the Comtesse describe her dislike of Marguerite St. Just, now Lady Blakeney, why does Sir Andrew fidget with his fork and Lord Anthony look uncomfortable, glancing apprehensively toward Jellyband, who also looks uncomfortable?