1. Invade Mr. Darcy's personal space while he writes.
2. Assume enough intimacy to look in on his letter.
3. Don't simply comment on his uncommonly good handwriting; comment "perpetually".
4. Do not be deterred by the obvious lack of interest with which your comments are received.
5. Emphasize (repeatedly) your intimacy with his dear sister.
6. While he is still writing, offer to mend his pen.
7. Go for a walk with Darcy and sarcastically plan his domestic felicity with Elizabeth Bennet.
In a word: Smother.
(This dialogue seems to be more for the sake of Elizabeth. Miss Bingley wants it to be perfectly clear that she is so intimately connected with Darcy and his affairs that she holds all the claims on him.)
