Well, Ferdinand was very fond of her..... as for grandmother the Empress-Queen, Caroline was, to her, "my charming granddaughter" (as Maria Theresa called Caroline in a letter to Marie Antoinette).
The Marquis de Bombelles visited Parma in 1791 and he wrote about Caroline's resemblance to the Dauphine (Marie Antoinette) in Strausbourg long ago. I guess he meant Caroline's countenance (i.e. expression and composure, if not exactly her physical features).