[Spoilers for the Big Finish audio Patient Zero. If you don't want to know, please move along.]
A young blond appears in the Nexus, looking completely nonplussed to find herself suddenly in a multidemensional pocket universe. She's never been here before, but, after having been prisoner of the Daleks for more years than she could count... and spending several centuries, invisible and unnoticed, on the TARDIS... her definition of strange may be the slightest bit warped. Taking one step aboard the TARDIS and the next in this Nexus was hardly worth raising an eyebrow.
She paces restlessly through the Nexus, talking to herself. If you were to get close enough to hear, you would realize she's saying, "Hello! I'm Charlotte Pollard." "Pleased to meet you, my name is Charley." "I'm Charley. Charley Pollard." She goes on in this vein, making slight variations on a bright, cheerful tone with each attempt. Practice makes perfect, after all!