Did you notice that in the fifth paragraph in the book, the first one that describes any events, how many "sad" references there are?

Sorrow, sorrow, loss, grief, mournful, no prospect of...cheer, she had lost

All of these in six sentences.

And then, in the next paragraph: promise; happiness; easy fortune; pleasant manners; satisfaction; self-denying, generous friendship; always wished and promoted; kindness; kindness; affection; devoted; attach; amuse; nursed; gratitude; perfect unreserve; dearer; tenderer recollection; friend and companion; intelligent, well-informed, useful, gentle, knowing; interested; peculiarly interested; every pleasure; affection

That's a very long list of positives--but they are all positives about was was, not what is.

It seems to me to show how conflicted Emma is about what's just happened, but that she is more sad than satisified.