She has other sources and was very concerned about the possibility of having to reveal those sources or going back to jail because of them.
While Judy Miller sat in jail for 85 days and Mr. Libby knew that she was doing it to protect him, no call came in from him, no letter arrived from him,
I know that the jail stay, which is the longest of any journalist in American history, was certainly not extended for any reason at all, ... and was served in the service of protecting her source.