"My Lady Ace."
She smiles at the technician to cover the fact that she still has trouble thinking of herself as a Time Lady. She's here on official business to inspect the TARDIS berthing bays.
She's nearly finished when she sees a flicker out of the corner of her eye, as one of the TARDISes engages its chameleon circuit. For just a moment, it looks like a battered caravanette. Ace feels it - her - like a wink in her mind.
She sets her pad down and slips inside. She's barely closed the door behind her when the engines rumble to life.