The Disappearance of Shannan Gilbert An Anthology of True Crime

After leaving a movie in Jersey City, Shannan kissed her boyfriend, Alex Diaz, goodbye. She had received a call out from a client in Oak Beach and promised to come back the next day. Diaz was not worried about her since she had a driver who acted as her security, pocketing half of Shannan's earnings. Shannan called her driver, Michael Pak, and the two drove off from Jersey City at around 10 p.m. that night.
Pak drove into the gated community at around 2 a.m., parking outside the client's home to wait out Shannan's appointment. He watched as she walked up to the door, and then settled in his seat to wait for her to come out so he could drive her back home. Sometime after 4 a.m., Pak saw Shannan running out of the house, seemingly scared and acting irrational. She kept stating that the client wanted to kill her, and kept running when Pak tried to help.
She was on the phone telling the person on the other side "They're trying to kill me!" Pak drove slowly in the community, trying to follow Shannan's screams and cries. He had never seen her behave like this before, so he assumed it may have something to do with drugs. Shannan, who was on the phone with 911 at the time, ran around the neighborhood looking for someone to help her. When she saw a light on in one of the houses, she ran to the door and began knocking frantically, screaming for help.
What happened to Shannan that night?