She'd continue to explore aroudn the lake without incident; she'd be stopped when she came across the slow-moving river, that fed into the lake. It wasn't very wide, but it looked fairly deep, and would be annoying enough to cross, and close enough to where she'd wanted to stop, that she likely wouldn't want to make the effort to continue.<br/><br/>As she was making her way back, though, she'd feel a sudden... shift, in the ground, which would be the only warning she'd get, before it suddenly gave way in a large radius around her, dropping her into an underground lake, some twenty feet below!