The judge stopped questioning not long after the question regarding visit to DC.
Still, this was a hearing on the appropriateness of the relationship between Willis and Wade and whether it tainted their management of the case against President Trump.
The rest of it (WH logs, etc.) would be relevant to a trial of Willis on charges of collusion or misappropriation of public funds, but not now. The lawyers were only asking about whether the two of them were in DC together, assuming they were hiding their relationship with out-of-town trysts. The lawyer didn't ask Willis directly if she visited the White House, she asked the judge if it was appropriate at this time to ask Willis if she visited the White House, and before the judge could rule Willis answered "No, never."
-PJ