Has she made a proffer?
Depending on what she has to say, I’d consider use immunity.
“Lerner recently offered through her attorney to testify if she was given a grant of immunity. Her attorney even provided a proffer describing the essence of her promised testimony, then subsequently claimed not to have heard back from the committee.
But the proffer talks went nowhere because the description of what Lerner would say if she received the grant of immunity broke no new ground, according to panel sources. The bottom line is that witnesses who don’t provide critical new evidence don’t get immunity.”