[And here comes Rarity's best whiny voice as she flops back onto the chaise, burying her face in the pillow and weeping uncontrollably. Because of course she's able to do this sort of thing on command.]

Pinkie Piiiiiiiiieeeeeeee, it's just terrible! This horrible, awful town showed me what a horrible friend I am, and I volunteered to disappear to save everypony in Ponyville, but it can't even erase me correctly! And now you and Nyanpire and Mr. Grimsley all think I'm a fake and it's just not faaaaaaaaaaiiiiiiiiiiiiiiiiiiir!

[Aaaaaaand back to the crying and rolling around. Eventually, she flops over and covers her face with the pillow.]

Don't even look at me! I'm too ashamed to be seen in such a state! I want... to be... alone.

[Lifting up a hoof to pose as she sharply turns away from where Pinkie is standing.]