Quick Transmigration: The Female Lead's Birth Mother Is Loved by Her Stepmother and Is a Stunning, Universally Adored Beauty

I read this a long time ago. In one of the historical worlds, the female lead was a princess who had been lost among the common people. Her birth mother was everyone's unattainable first love, and the empress, her adoptive mother, loved her too. There was also a short bonus chapter. I can't find it, so please help. Thank you!