I recommend 'Concubine in a Prosperous Age' to you! The female protagonist, Mu Xiyan, and her friends had accidentally transmigrated to the virtual Nan Yu Country while shopping. Because of Mu Xiyan's bicolor eyes, she was valued by the Empress Dowager and made her and the Emperor become Consorts Zhen. This book also has a plot where the female lead and her best friend transmigrated together! I hope you like this fairy's recommendation. Muah ~😗