"Young Lady" is the name she apparently has everyone in the Demi-Immortal Institute call her by, though the full title she uses is "Young Lady Starlight". The Chancellor of the institute, her father, has also called her "Guang’er", revealing at least a part of her real name.
Young Lady was sent along with Yang Qi on Mission: Mend Heaven, an incredibly dangerous mission to repair the Planar Pearl, albeit in a supervisory role only. It was later revealed that she was only there by way of an illusory projection, created by the use of her Cosmic Mirror. While only a projection, she was still able to attack the various fiend-devils.
The Chancellor remarked that it was entirely possible that she could become a Great Sage before the Crown Prince, thanks to her unique body. She has a Nascent Divinity Starlight Body, which comes from one of the most respected of the ancient humans, the Starfolk. It is comparable to the Seven Apertures Sprite Body, the body type that Yang Susu has, both of which were created by the ancient legion of gods.