My thought is they're feeling her out. An outsider appearing would have to be one of the most jarring experiences - now they know she's skilled, and I have a feeling she's about to obtain another unwanted side quest. I do wish they hadn't leaned so hard on the bends though, there had to be a better way to get that in there without making it over the top obvious like that.
I'm thinking they probably couldn't kill Solo without an alternate way to get into the IT vault, and they may now think they have it. That may look like Solo being a hostage, or being dead with Jules breaking into IT being her price to get out. Either way, I would think she finds some valuable information in there.
We can now venture a guess Solo acts like a paranoid loon because there is actually something out there to be paranoid about
I'd also guess they have tried to get into IT more than once, hence the damage to the locking mechanism and the bodies (which I have been thinking since we first got here)
Lukas and the tunnel being her way out seems like the way the story will go though.