This lady is Murasaki no Ue, one of Genji's wives and his most beloved partner.

In the Heian era, having multiple wives was not uncommon in aristocratic society, and Genji couldn't resist the emperor's request to marry his daughter, San no Miya, who was still fifteen years old and immature.

Murasaki no Ue was very sad but understood Genji's circumstances very well. One night, hiding her sadness, she let Genji spend one night with San no Miya.

In those days, having extravagant long hair was considered an essential part of feminine beauty.