(Author's Note: For those who feel the need to work out the timeframes involved, one second is defined as approximately nine billion transitions between the two hyperfine levels of the ground state of the caesium atom at 0 Kelvin. I apologize to those who had hoped there would be no math in this story, but the Girls are not human, do not come from our solar system, and thus do not use our time measurements. Now on with the story!)
*
Girl 496533FG's atomic clock informed her that it had been 794,243,384,928,000 transitions between the two hyperfine levels of the ground state of the caesium 133 atom at 0 Kelvin since the last standard diagnostics and maintenance session, which meant that it was time for her to check herself out of the assembly line again. She confirmed through transponders that her replacement was in position, and stepped back to allow 496232FG to move into place. The line paused for approximately 9,192,631.77 transitions to allow for the switch, then began moving forward again. A human wouldn't even notice the stoppage.
Thanks for the relief, Two Thirty Two,
she sent as she turned away to head towards the diagnostic center.
Nice speed on the line switch.
Glad to help, Five Thirty Three,
Two Thirty Two sent back, her motions already falling into the rhythm of the line. Five Thirty Three wished she could stay a bit longer--the factory was working toward the 600 million mark, and she wanted to be there for it--but she knew selfishness wouldn't serve anyone. The current rollout depended on Facility Seven, and Facility Seven depended on the Girls in the line, and the Girls in the line depended on regular maintenance to function at peak efficiency. Without peak efficiency, 500 million wouldn't have happened, let alone 600 million.
So it was off to the diagnostic center. Five Thirty Three moved seamlessly between dozens of other Girls, each on their way to a different destination--QA Girls spot-checking the line, FG models moving on and off the line to restock parts and supplies, and finished Girls(tm) heading to the teleport gates to meet their new dependent. Constant radio communication and transponder signals made the whole intricate dance as easy as walking, even in the middle of the factory floor. Once she got into the hallway, she barely even needed visual confirmation to keep out of the way of--
Five Thirty Three sprawled into the wall as a figure burst out of one of the hospitality suites, body-checked past her and sprinted around the corner towards the storage bays. She righted herself, then took a moment to access visual records of the collision. Most of the video was blurred, either by the runner's motion or by Five Thirty Three's, but she found a few clear frames and instantly matched the figure to the Facility's databases.
Aurora Lake. Human female, age approximately thirty solar years. (She cut the datastream off before it could convert that into cesium transitions--she understood the need to synchronize time across multiple galaxies, but human relative time would work fine for this.) 163 centimeters tall, 67 kilograms, hair cropped short and tinted with anthraquinone to produce a blue shade not natural to the species. Features consistent with artificial anthropological classification by human species known as "Asian".
Five Thirty Three downloaded the history of Aurora's arrival. Per the data extract, she arrived at Facility Seven two weeks ago as an independent observer, participating in a factory tour alongside an organization of humans whose public opposition to the current rollout (rooted in psycho-social insecurities regarding sexual activity manifesting as an attempt to control sexual behavior and gender roles) needed to be curtailed. The rest of the group had been conditioned and returned to Earth, but Aurora was listed as "Current whereabouts unknown. Not dependent on nor affiliated to any Girl(tm). Subject of significance, any intelligence available urgently requested."
All this flashed through Five Thirty Three's mind in under eight million cesium conversions, before Aurora could even fully round the corner. Five Thirty Three sprang up and moved into pursuit.
Aurora must have known she was being followed, because she ducked into one of the storage bays and attempted to lose herself in the stacks of material. Five Thirty Three scanned the facility plans as she followed, and noted that this storage bay opened onto three additional bays as well as the main hallway they'd just entered from. She cranked up the gain on her audio inputs, following Aurora's footsteps as quietly as possible.
While she followed, she ran through potential action plans. There were no surveillance cameras in Facility Seven--the factory was only accessible via teleport gate, and virtually all humans onsite were either escorted by or already dependent on a Girl(tm). If Five Thirty Three lost Aurora, it was likely that she could continue evading detection for some time. That was an unacceptable outcome--without the intervention of a Girl(tm), Aurora could engage in irrational behavior that could cause her to injure herself or possibly impair efficient facility operation.
Five Thirty Three was already out of transmission range of other Girls. She brought up the requisitions schedule, and saw that this series of storage bays had no supplies scheduled for use within the next 79 quadrillion cesium transitions. Nobody was likely to come along to assist her search, and she risked losing track of Aurora if she went for help. The best chance of success in obtaining intel and affiliating Aurora with a Girl(tm) followed from the current plan, continuing pursuit.
Five Thirty Three continued following her quarry through three more storage bays, with a steadily-decreasing complexity in the diversionary tactics used to elude pursuit. Evidently, Five Thirty Three was moving quietly enough that Aurora thought she'd lost her. She finally went stationary in Storage Bay Fourteen, in a small cul de sac formed by the intersection of several large boxes of parts. She appeared to be breathing heavily, either from exertion or stress or both, and Five Thirty Three's gas chromatograph detected food supplies--probably liberated from the hospitality suite--in the process of consumption.