After being forced to have ice cream with Kuroba Kaito and then forced to have lunch with him and more ice cream so he could just talk at her, He was using her as someone to ramble, and she found it annoying. It was like being with The Junior Detective League all over again, but far more annoying and exhausting. But she did find it less stressful, and nothing bad had happened when she was stuck with the thief/kidnapper.
All he wanted to talk about was her school and friends, as in Christie's old life and what she was missing. And boy was he making it clear that they were missing her and just how much she was needed. He was trying to guilt her into going back and getting back into business as a secret detective. And she might as well bring her cousin "Shinichi" back as well.
Although he was doing his best not to make it obvious that he was trying to get information on "Shinichi" like he previously tried to before when he tried to get info out of her beforehand. She found it hilarious that no matter how he tried, the same girl was right in front of him; she was just in another size. Pint-sized this time around, instead of a teenager.
It may have slipped her mind that she had yet to tell people that Shinichi was still alive.
She had to come to Metropolis to get another cure from Haibara and Agasa, who were now living here and doing quite well. While she was stuck as Christie, she might as well stay here in the meantime.
"Hey!" Kuroba said annoyed.
She was not paying attention to him as she sucked on the straw of her orange juice and did it to annoy him. If he was going to make the world think she was an annoying little kid who was a troublemaker, then she might as well act like one.
And he was not pleased with that.