The infamous elevator fight relates directly to Rachel.
According to a source from E! Online, JAY-Z and Rachel were uncomfortably flirty at a Met Gala afterparty. The source revealed that the flirting was a thread through the night, but it elevated during the afterparty at the Boom Boom Room, a rooftop bar at the Standard Highline Hotel. According to the source, "Beyoncé approached Rachel to let her know the behavior was disrespectful and she wanted her out of their lives for good. . . . Solange came over to have her sister's back, and things got heated. . . . Jay said some disrespectful things to Beyoncé and Solange as the confrontation was going down." The argument with Rachel eventually ended, and Beyoncé, JAY-Z, and Solange left. That's when the elevator attack happened.
When Jay Z and Beyoncé skipped Kim Kardashian and Kanye West's wedding later that month, it was reportedly because Rachel, a close friend of the Kardashian-Jenner clan, was in attendance.