Why not both?
For instance, the Chinese may have known they had spies from DiFi but needed (paid) access to Hillary’s info to know who.
Could have been both. Just guessing as to which seems more likely.
I guessed Hil, because she has a known record of selling secrets and being cavalier with confidential info. And, I view her influence peddling as a subscription service.
But, having a Chinese driver listening in, if not actually reading over her Dianne’s shoulder, is definitely another avenue for info.