going to visit her aunt after the near elopement. She would have been very upset and perhaps went with her brother to Pemberley or to London.
But she could have been in Rosings before she went to Ramsgate. Lady Catherine:
"When my niece Georgiana went to Ramsgate last summer, I made a point of her having two men-servants go with her. Miss Darcy, the daughter of Mr. Darcy, of Pemberley, and Lady Anne, could not have appeared with propriety in a different manner" (Ch. 37)