She probably did and didn’t like the results
I agree with others that Warren has very likely had the test done. Just have someone else order a kit and send it in with a fake name. Although if she did that with ancestry.com or 23andMe, it would be funny if a cousin or closer relative also sent their dna in and she was matched as a relative. (The daughter of a second cousin recently sent in her DNA and then asked her her dad why this woman would come up as her aunt. My cousin whose approaching 80 found out he had a half sister no one in the living family knows about - they made contact and have met.)