Sansa wishes that Eddard sent Loras after Gregor because that would be oh-so-romantic!
Although Petyr did tell Sansa the other day that she might find out that life is not like a song – but what does Petyr know?
When Eddard tells Sansa and Arya that he's sending them home to Winterfell, Sansa tells him that he can't send her because she loves Joffrey "as Queen Naerys loved Prince Aemon the Dragonknight, as much as Jonquil loved Ser Florian. I want to be his queen and have his babies" (65).
Then Sansa tells Eddard that Joffrey is nothing like silly King Robert. At this point, you can almost see the light bulb over Eddard's head. (Or, this being medieval-ish, a candle.)