This statement is not wrong, at that Shichen, Nanny Qi was indeed resting, just in Huaying Hall.
Upon hearing this, Lian Hua's eyes lit up. A flaw had appeared. Nanny Qi's rest time was nearly the same as hers, and she had woken up in the afternoon, yet Nanny was still resting. That's not right.
Thinking she had found a flaw, she put down her chopsticks, suppressing her excitement as she asked, "Nanny, you never rested for so long before, why today—" Her tone was full of unfinished implications.
Nanny Qi remained unflustered, still chewing contently. Only after finishing her bite did she speak, "Today's noon meal might have been a bit too much, I felt bloated. Having relieved myself once, it was quite a while after you rested that I finally went to rest."
She casually picked up a piece of meat and placed it in Lian Hua's bowl.
"Oh…" That could make sense. Nanny Qi did say she needed to relieve herself earlier, which she had interrupted. All right then.