No, she really couldn't help him with a mob. She could escape one alone, probably, unless they were very savvy and brought shovels, but save someone... only if it was a very tiny mob that could be killed by one Gangrel.

"And no, I don't," can't, but she'd rather not put it that plainly, to dodge further questions or deductions, "but I don't mind sitting down and setting up my phone while you get one."