They were staying the weekend. Mostly, it would seem, they chose the casino so they'd have an alibi though. Cameras everywhere.

Anyway, my feeling is she was the lonely divorcee who fell for the bad guy who talked her into this and those bumbling fools had no idea what they were doing or that they'd blow the entire neighborhood up. Either way, guilty guilty guilty.

eta: lisa, just saw you have the same "feeling" about her being led astray by the wrong guy. i just can't imagine a woman thinking this up on her own. pretty sure she knew what the plan was and agreed to it tho.