Impertinent—A trifler; a meddler; an intruder; one who inquires or interposes where he has no right to call. L’ Estrange. A rude, unmannerly, or saucy person. Spect. Ref: A Dictionary of the English Language by Samuel Johnson, 1824, page 375.

I agree Isabella does not keep her distance with men and because of it I think she may be a great favorite with them. In chapters 6 and 7 she attempts to attract the attention of two men unknown to her because one is very good looking. Isabella’s great spirit in chasing after them is rather impertinent and I think some men would respond in kind but her complaint about it may be just for show—a concession to how society suggests she ought to feel. Why should Isabella mind impertinent behavior towards herself when she feels nothing wrong in her own?