Fred blinked at the whole sugar container bit, but maybe she had a sugar problem, or maybe she had a pet under the table. Maybes abounded, and who was Fred to question? This was only a little awkward, and the Doctor's joke...Fred wasn't sure if she should answer him truthfully or not.
"They've got really good pancakes. Haven't tried the oatmeal. Is it any good?" Okay, so she went for totally missed the joke.