Leila Williams is a former submissive of Christian Grey. Their relationship occurred approximately two and half years before the events of Fifty Shades of Grey. She left Christian when she met her husband. Four months prior to the series it is known that she left her husband for a lover named Geoff, who was killed in a car crash. After her lover's death, she had a mental breakdown.
Leila, like all of Christian's former submissives, is a brunette. Her eyes are "brown, like bourbon". Anastasia is struck by how much she and Leila look alike. Prior to having a mental breakdown, she was "lively" and "mischievious".
Fifty Shades of Grey
While Christian is in Georgia with Ana, Leila breaks into Escala and cuts her wrist in front of Mrs. Jones. She is rushed to the hospital immediately, but checks herself out before Christian can fly back in time to help.
Fifty Shades Darker
Leila stalks Ana while she is at work. When Christian finds out that Leila has obtained a concealed carry permit, he insists that Ana stays with him at Escala; however, Leila is still able to break in into his penthouse apartment and watch Ana sleep.
Several days later, Leila breaks into Ana's apartment in Pike Place Market and threatens Ana with the gun. Christian is able to get Leila to lower her weapon, and calls Dr. Flynn to take her to a psychiatric hospital.
Fifty Shades Freed
Christian tells Ana that Leila is doing much better, and is attending art school on the east coast. Ana is surprised, then, when Leila shows up at SIP, wanting to meet with her. She apologizes to Ana for the incident in the apartment, and confesses that she loved Christian at one time. However, her primary reason for visiting Ana at work was to trick Christian into rushing to Ana's side, so that Leila could talk to him in person. Leila knew that he would rush to protect Ana when he heard that Leila was back in town. Her ruse works, but Christian is furious: he threatens to pull his financial support for her schooling and medical care if she ever tries to contact him or Ana again.