She has been like a robot at quite a few times throughout the series but tonight tops the lot. First it was her "I'm going now" whilst aimlessly wandering around the bedroom until settling for a door in the garden, then just ignoring everyone, then that manic laugh!
And it was a bit strange when they filmed other people and Lisa outside of the house, it was like the housemates are actually real if people get what I mean? Car crash telly at its best is what that was.