SIAP but think about Gemma's outie experience in the last episode. She is suddenly surprised by Mark when he leads her out of Cold Harbor. They escape to the elevator, climbing over a dead man. Then she's Ms. Casey. Then her outie resumes consciousness in the locked stairwell seeing her husband walk towards another woman and ignoring her pleas. I'm fairly certain she doesn't know that Mark has been severed and does she even comprehend that she's severed?
And does she have an easy method to get out the building including potentially having to walk up many levels to get to the ground floor. All while the building is in some red alert emergency status? The writers could somewhat get out of that problem if Cobel has discovered a method to get her or Devon into the building to assist an escape but we just didn't see it yet. It's reasonable to think that alone, Gemma would soon get caught due to her disorientation and uncertainty where she is. They have a guard at the top of the elevator, it's doubtful the stairwell opens up unguarded to the outside like a fire exit.