Diary of My Better Self

Vignette wakes up in Equestria as a pony Adagio. She's horrified, until she looks in the mirror.

One moment, Vignette Valencia was at a convention, satisfied with her recent purchase of the most stunning ruby necklace she’d ever seen. The next, she was a pony in a strange world.

And what's a girl to do in a strange world but write about her experiences?