Winter is fighting to protect her sources' identities. If she is ordered to disclose her sources but refuses, she could be jailed.
At Wednesday's hearing, Holmes' lawyers are expected to re-question an officer who testified in December that he didn't speak to Winter about the notebook, but who wasn't asked if he spoke to anyone else about it.
The judge ruled Winter must be present.
Follow Dan Elliott at http://twitter.com/DanElliottAP .