or safe. That was the reason I suggested that she stayed somewhere. I have a hard time imagining Lady Catherine and her waiting-woman riding for several hours in a carriage overnight -- not to mention whether or not there would be any place to stop to rest the horses.

I think that it was equally likely that she was so impatient to leave that she left Rosing in the late afternoon and arrived wherever she planned to stay the night before it was too dark, then arose early enough to get a good start in the morning for an early arrival at Longbourn.