If Shisui had a mite less self control, he would have laughed. Giggled, because she was going red. It was fun to take someone off guard with compliments--some were smoother than others. This young lady happened to be one of the less smooth ones.

"Ah, I said you were one of the best up-and-coming kunoichi I've seen in a while, miss," Shisui repeated, eyebrows arched but the smile still on his face.

She likely hadn't heard of him--Shisui's biggest and most well known talent was his speed... And he was surpassed by the Yondaime Hokage (albeit in a different way, but Shisui wasn't shallow enough to point that out). If she was at all interested in Uchiha politics, she might know him, but Shisui didn't think anyone would willingly inflict that headache upon themselves.

Honestly, Shisui only vaguely knew the girl. He'd seen her in a chunin exam, a proctor giving running commentary on her skills throughout her match. She was good, but not yet good enough to warrant a stranger's comments.

But, Shisui was a good liar. It was what he did for a living, so he ran with it, just to see what she'd do.