Echo is able to find some stored video of what the drones had seen since being reprogrammed, though it's a lot of film to go through and will take her a few minutes of fast forwarding and rewinding before she can note anything important. While she is at it, she is also able to find that she would be able to access the data from her present location, though that section of this isolated Matrix is heavily defended by some pretty tough ICE if she decided to give it a go from here.
In fact, all her actions have finally gotten her noticed. Inside the Matrix, a Patrol IC appears in front of her and scans Echo's mark. At the same time, you hear an alarm begin to go off inside the building. It seems the Patrol IC security is connected somehow to the building security.