Her refusal to answer rather than lie or FIB is probably because she knows that she will be back if Republicans don’t blow their elections in the House and Senate.
....is just more in-your-face bureaucratic arrogance.
"I'm not going to tell you and what are you going to do about it."

I believe it was Ryan who was blocking Devin Nunes’ subpoena requests in 2018 or so. What was McCarthy’s position on congressional investigations of Crossfire Hurricane back when he was part of leadership for the majority? How many swamp fifth columnist GOP committee chairs like Lindsey Graham will we be relying on this time? Nunes is gone! Does Matt Gaetz get a significant chairmanship, Jim Jordan?
she knows, she doesn’t want to get hit wi perjury...
It is a serious matter in an inquiry when a witness fails to answer unless their particular political party is in power at the time. It seems a bit obvious that the particular witness knows something & does not take the 5th.