Maybe she's covering all the bases, in case the dna does match? Strange that one day she's "certain" and now it's more like a "maybe."
A poster recently said he could think of NO reasons why she would say this if it isn't true.
I gave him 3 possibilities off the top of my head.
She has 3 sons whose dad has confessed to murdering Jon Benet Ramsey. She would like for that reason alone for it not to be true.
She could be feaful that she actually has known or should have known something about him that she should have told authorities and didn't. If he's really a notorious murderer, and she could have done something to stop him but failed to, she might be an aider and abetter.
She might have a poor memory. Some people do, and in some cases they actually have an illness including metal problems that could affect their memory.
I never heard back from that poster.
Surely you could think of even more possibilities than I have...
If she thinks she needs to cover her bases in case it is a match, then she's not certain.