The statement was released after Games bosses leapt to Camilla's defence yesterday, declaring she had been jet-lagged.
Commonwealth Games Federation president Louise Martin said if Camilla came across as bored, it was "not true".
"She did full duty right through and the only time she got a break was when she sat in the car from Brisbane down to here,'' she said.
"Then she got 20 minutes to change before she went to another reception. When you're back to back like that, coming off a long-haul flight ... and she literally hates flying. She really wanted to go to sleep.
"She really enjoyed herself (at the opening ceremony). I didn't see the facial expressions etc but the comments between the Duchess, Charles and myself — she was asking questions all day.
"They both enjoyed it.".
When it was pointed out that Camilla had spent two days in county NSW before flying to Brisbane, Martin said: "She's still coming off a long-haul flight."
Beattie said the Duchess was 'enthusiastic in any dealing that I had with her'.
Prince Charles attended the swimming finals last night while the Duchess was a medal presenter at the track cycling.