What classical story is the figure in the above painting

She plays the part of a Roman priestess making a sacrifice to the personifications of female beauty, the Three Graces.
Answer:
The Three Graces is the correct answer.
Explanation:
In this painting, The Three Graces can be seen in the top left corner. This is a part of Greek mythology about three goddesses that personify charm, grace, and beauty. Even though there are many versions about the number of them, Greek philosopher Hesiod describes three Graces.