The below paragraph is from "Roman Fever'.
"Alida Slade's awfully brilliant; but not as brilliant as she thinks," would have summed it up; though she would have added, for the enlightenment of strangers, that Mrs. Slade had been an extremely dashing girl; much more so than her daughter, who was pretty, of course, and clever in a way, but had none of her mother's—well, "vividness," someone had once called it. Mrs. Ansley would take up current words like this, and cite them in quotation marks, as unheard-of audacities. No; Jenny was not like her mother.
What does the ‘current words’ mean? Why ‘in quotation marks, as unheard of audacities’?