The Empress represents femininity, beauty, and abundance. Sweetie Belle fit the bill pretty well. I see her as growing up to be a performer and probably a part-time model for her sister. She's graceful and bright and talented, which I think makes her a good fit for this card.

Abundance is represented in this card by the wheat and the cornucopia. The symbols of Venus on the throw pillows are there to symbolize femininity. The crown of stars and the forest scene itself reflect the Empress's connection to nature, its patterns and cycles, and its abundance.