Aha me too ! Certainly because it's the first moment in the game where you use the elevator !
But the thing is , you really have to be very close to this button to activate it. First time I tried , it didn't react, so I searched the whole thing.
But about that girl: She's the only survivor, who still survives when we left ! who's she ? Alma's sister maybe !
I doubt it...
>>SPOILERS AHEAD!!!<<
Black Ops ends up demolishing that building, I doubt that she would survive something that. But, you never know...
>>END OF SPOILERS<<