I think it was deliberate, but she should only be able to get away with that gimmick once. Next week's theme should favor the same contestants as this past week (Elliott, Katharine, and Paris), which I find very odd scheduling. They should have thrown something inbetween "American Standards" and "Greatest Love Songs". It probably came down to scheduling issues with the guests...
She's used it twice so far. I think the other time was Blame it on the Sun. I definately remember her pouting and saying she was saw reee.