She should spill the beans all the way to the top in exchange for total immunity.
She needs to do time... no matter what. Offer her a shorter sentence or something, but not total immunity. This is too serious to be letting people off the hook completely.
That is just it, she can’t spill the beans because she wasn’t specifically TOLD to use the power of the IRS against conservatives. She just did it thinking it is what Obama would tell her to do and to be a good little socialist. Issa won’t give her immunity because he knows that it will be letting the biggest fish he is likely to get off the hook.