If you are new to the game, it may take some time for your Fashionista to be ranked. Be sure to feed and take care of her. After some time (a few hours to a few days) she should appear in the ranking. On the ranking page, the top chart is a list of the top 20 Fashionistas. If your Fashionista is not in the top 20, she will not appear here. She should, however, appear in the bottom chart.