She infiltrated as a darksider university student. Rosalie was a graduate research assistant of engineering at the university, somehow managing to juggle classes, work, and family secrets.

When not sleeping in the library, Rosalie could often be found in the Ideograph Cafe with her close friend and roommate, Thorne (the Conspiracy Theorist). And, naturally, no engineer would ever miss the upcoming Tinker's Fair.

This time around she had an unusually large network of infiltrator CR, including a family. Prominent CR was as follows:

Melisande - Her beloved mother. Rosalie feels pretty close to her since Melisande pretty much raised her alone. She moved out solely because she felt it was time to be a little more independent, not due to any conflict, and visits home frequently.
Daneel - Her biological father. Rosalie doesn't feel terribly close to him but is making an effort to include him in her life. They regularly meet for awkward father-daughter coffee & catch-up.
Liara - Her stepfather. They have an amicable relationship, bonding over technology and family secrets.
Imriel - Her much younger half-brother, whom she spoils endlessly, usually with toys she's made while tinkering in the workshop. And sweets.
Thorne - Her roommate and close friend. Rosalie is very skeptical of Thorne's...everything, but considers Thorne's eccentricities a small price to pay for a responsible roommate who doesn't mind Rosalie setting up a mini workshop in their living room.