Rachel knew the situation was dire and they needed to get out of there as soon as possible otherwise they wouldn't make it.
Rachel was smart enough to know that if she left them now, she could certainly survive.
She had no intention of risking Lillian even if it meant saving Jason, Lillian remained her priority.
Rachel knew that things were going to escalate seeing as these new zombies didn't even need to bite their victims to get them infected.
All they needed was their substance to touch their target and that was it, and the rate at which they mutated was way too fast.
It was a miracle that they hadn't encountered more, Rachel was almost at her destination, she had to secure the car because if anything, this would also be Bella's destination.
Unknown to Rachel, Bella was not even capable of thinking rationally yet alone, coming for Rachel.
