How does Donna answer?

No

"I'm sorry, little girl," said Donna. "I'd really like to help but unfortunately, my hands are tied. Besides, I can't stay here much longer. Bad things tend to happen to time travelers who spend too much time in this neck of the woods."

"Well, duh!" said Dawn. "I could have told you that."

"Anyway," said Donna, "the Doctor and I have a universe we gotta go save."

"Oh, please," said Dawn. "Can't you do something?"

"I wish I could," said Donna. "I really wish I could. But --"

Just then Dawn heard what sounded like the ringing of a distant church bell. And noticed at the same time that Donna's face had turned white the minute it started ringing.

"Oh my God!" said Donna. "It's the cloister bell. It's the TARDIS's cloister bell. Now I gotta get out of here for sure!"

And with that, Donna hastily walked away, leaving a naked Dawn alone in the alley.

"Well, with any luck, that will be the worst thing that happens to me today," said Dawn with a shrug.

Then a familiar-looking woman in a red dress walked up to her and said, "Hey, kid! Any idea where I might find a Key around here? And why do you look so familiar? Have we met?"