The only way for them to move in thousands of DCP interns to their apartments is to dedicate each weeks arrivals moving in to the same apartments. In between each group they have to go in to the apartments and do maintenance, prepare them for the next group.
No matter what avenue she would take to find her roommates there would be no guarantee she's going to be happy with them. And just so you are aware, she may find 3 roommates and they put in for a 2 bedroom, 4 bed apartment but get there and be assigned with 2 bedroom, 6 bed (3 to a room) or even a larger 4 bedroom, 8 person if say housing fulfilled the requested complex but not the apartment size. That means even though she has 3 roommates picked she could end up with 2-4 strangers.
It is nerve wracking and I can understand her concerns. It's a big decision to make. DD initially went down to look at off-site apartments because she is picky about room mates but she decided the only way to fully appreciate the experience was to jump in with both feet. She loved it, extended, made good friends and it's been an incredible experience.