If I remember correctly some repub senator (Spectre?) DID ask her about her "No Blacks" policy. He then apologized and refrained from asking any more "tough" questions.
That was Orrin Hatch. He exposed her hypocrisy on this issue, then let her off the hook. He asked her whether a low percentage of minority employees makes an employer guilty of racist hiring practices, and should that employer be sanctioned. When she gave her emphatic yes, he pointed out that she had never once hired a black person, although she had hired many people. Presumably he did it to make a point. I believe he voted to confirm her.