Bess had a great fondness for Italy, especially late in life when she chose it as her place of retirement. However the same cannot be same of Italy's feelings toward Bess in 1785. Much in the tradition of her visit to France, Bess sowed offense wherever she went. First of all, whenever she whisked by she left the Italians gagging on her perfume. Wearing perfume in Italy was a big no-no. Not knowing your cross-culture etiquette could easily be societal suicide, especially for a determined social climber such as Lady Foster. So it didn't help her ambition any when she caused further offense by freely speaking her broken Italian to everyone. I would give her points for trying the immersion method of learning a language but at the time it only came off as pompous.
Next time Bess, try Rosetta Stone and a dab of vanilla behind the ears!