She flips a switch.

Unknown to everyone that worked on Baby's new body, they were given the wrong schematics. While the blueprints were mostly the same, some of the data-processing hardware was set incorrectly in those prints. It was only pure luck that made the errors it called so minor, in a way.

Of course, it wasn't minor to Baby. When, halfway through her walk back to her room, she finishes the last stage of booting up, her sexual sensitivity sensors experienced an integer overflow, and redefined her new sensitivity. Her new lowest setting was twice as high as her old highest setting, and her new highest setting... it would hit her hard, when she finally got there.

Of course, that wasn't all that changed. Her pain sensors now amplified her sensitivity. Because she was that unlucky.