She's a young beautiful girl taking her name from a queen in mythology. Calista is proud of her beauty and takes all risks to immortalize this beauty. In the end, she gets what she wants. She starts to shine making goddesses jealous, and devotes herself to do favours by merging her outer beauty with her soul beauty. After a while, her soul becomes so beautiful that it's impossible for her to remain mortal. Gods gives inner beauty to Calista and this reflects on her outer beauty as well.
The name "Calista" is the Goddess of Beauty from that time on, and reflects pure beauty.
Flawless beauty, Goddess of Beauty...