You can read my feature on the changes in hairstyling fashions during Jane Austen's lifetime here on the Historical Honey website.
Image from the author's collection:
Piozzi (Mrs Thrale) in the 1780s. Note the ‘high’ hairdo. An engraving by E.
Finden after Sir Joshua Reynolds. Johnsoniana
Vol. I, Henry G. Bohn, 1859.