"Ah. Interesting. I'm guessing that you like the sound of the title than what your name was?" She asked curiously. Upon hearing why this, Doctor had been away from Jack, she nodded slowly. "Understandable I guess." She added.
Jack looked from his friend to the Time Lord. "Known her for a few years now. I saved her from being sacrificed to some Argon. Helped her understand what I do and has not only been friends with me but Qwen and Ianto as well. She hangs out at the base when she can." Harkness explained. 
Arwen smiled as she nodded. "Yep!" She turned her attention to Jack. "Mall? And ready for round 2?" She asked Jack. He smirked and nodded. "You bet. Oh. The Doctor and I got you something. Go check the passenger seat and between the seats." He informed her. She got all excited and ran up to the SUV, getting into the back seat. Jack followed suit after shutting the door.