It won't matter if you leave the lights on or turn them off, but I would recommend you follow our regular schedule.
Don't let her see you watching her while she's digging. She should lay all the eggs one after the other and when she's done fill in the hole and tamp it down return to the branches. She may sleep in the hole overnight...so don't worry if she does.
Do you have a container set up to put the eggs in when you dig them up?
Good luck!