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You find her in the toilets, you know the room where you found the pistol/miscellaneous item in the sink? She'll be sitting against the cubicles. This part pissed me off to no end when I was stuck on it, I checked EVERYWHERE but the toilets figuring she'd be in the cells downstairs coz you know it would be more logical :I

I'm not big on maps or location names, if this doesn't help make your way to the large room with all the desks in where you first fight the cerberus at the start of the game, one of the rooms in that section are the toilets, as soon as you enter the room it's like a cutscene and then you can carry on to the tram for the next part.