As Lauren reminded us today, it is the sad 215th anniversary of Marie Antoinette's execution. For the best visual of how horrible this experience was for her I would recommend reading, My Lady Scandalous by Jo Manning, who paints a horrifying picture of how awful this execution really was (blood, guts, stink, the whole bit).
As you can imagine, Georgiana was distraught when she heard of her friend's death. She was haunted by the image of her final moments:
"The impression of the Queen's death is constantly before my eyes, how anxious I am to know how my dr sister will bear it.* Besides the admiration that is universally felt for her and the horror at the barbarians, her answers, her cleverness, composure, greatness of mind blaze forth in double splendour, and the horror of making the child appear against her is what one shd have hop'd that the mind of man was incapible of..."
*Harriet met MA while she got her education in a French Convent and was also close to the queen.