Alida Slade makes no secret of the fact that she looks down on Grace. She sees her as a little mouse of a woman, who lacks the toughness and assertiveness to get what she wants in life. According to Alida, Grace and her family are dull as dishwater, leading lives of stultifying boredom and high moral rectitude. Grace is pretty much the exact opposite of Alida in every respect, and Alida cordially loathes her for it.
Alida's low opinion of Grace is also shaped by the cruel little trick she played on her lunch companion back in the day. Ever since that fateful evening when she sent Grace out into the fever-ravaged streets of Rome on a fool's errand Alida has harbored nothing but contempt for the woman who's supposed to be her friend. She's also insanely jealous of Grace for having such a vivacious daughter, Barbara, who overshadows her own, comparatively dull, daughter Jenny. There's a good reason why Barbara's so much more to Alida's liking than Jenny, and when she finds out what that reason is, she'll be made to look like the hapless dupe she always believed Grace to be.