In the Introduction Chrystal escaped the Fortune City Arena outbreak by heading to the Safe House. She was among the last group of survivors to make it inside. When the doors are opened by Sullivan, she and the rest of the survivors are briefly screened and admitted access to the shelter, where she awaits military rescue.
Case 6-4: BreachEdit
Depending on the ending, Chrystal was either rescued by a helicopter sent by the Channel 6 News Station, killed by the military firebombing, or killed by or killed by Sullivan to cover up the truth behind the outbreak when the military arrives.