Exploration
She had never been alone in the mansion before, she never really noticed how big it was. Since she had no earthly idea when Oliver was going to be back, she decided to go explore a little bit of the manor.
She took herself down one of the long corridors that led off where his bedroom was. She opened a few doors just to find normal rooms. She continued on, when she stumbled upon a door that was locked. This peaked her interest. She jiggled the handle; she even tried to pick the lock. No luck. Then she noticed the mat next to the door; there she found a key that would unlock the door. The next thing she found was a staircase that led down to basement area.