Lydia was Lydia still

Lydia is really annoying in this chapter. She is totally oblivious to the unhappiness and turmoil she caused her family. The cold reception of her father and elder sisters means nothing as she "never heard nor saw anything of which she chose to be insensible".

Her recitation of her stay at the Gardiners, shows what an empty headed brat she is.

you are to understand that my uncle and aunt were horrid unpleasant all the time I was with them. If you'll believe me, I did not once put my foot out of doors, though I was there a fortnight. Not one party, or scheme, or anything! To be sure, London was rather thin; but, however, the Little Theatre was open.

And I like how JA re-inforces Lydia's bad behavior in her letter to Elizabeth

And there was my aunt, all the time I was dressing, preaching and talking away just as if she was reading a sermon. However, I did not hear above one word in ten, for I was thinking, you may suppose, of my dear Wickham. I longed to know whether he would be married in his blue coat.

but I would not tell you how little I was satisfied with her behaviour while she staid with us, if I had not perceived, by Jane's letter last Wednesday, that her conduct on coming home was exactly of a piece with it, and therefore what I now tell you can give you no fresh pain. I talked to her repeatedly in the most serious manner, representing to her all the wickedness of what she had done and all the unhappiness she had brought on her family. If she heard me, it was by good luck, for I am sure she did not listen. I was sometimes quite provoked, chap 52