"You will have a
charming mother-in-law, indeed, and of course she will be
always at Pemberely with you." Indeed, Caroline (in a fit of jealously) teases Mr. Darcy for liking Liz's eyes and in so she tries to warn Darcy of the potential "disasters" that could and would await him if he were to take his affection any further. Moreover, Caroline mocks Mrs. Bennet by sarcastically referring to her as "charming" as it is quite obvious that she is annoying and ditzy. She then concludes to tell him how he will always be at Pemberely with Mrs. Bennet. And being at Pemeberly forever, on the country-side, is neither a good nor sophisticated thing.