I'll go with the drugs theory. Seeing her say with utter confidence that she didn't say what she said makes me think she may have some issues. We'll see.
I think the drug theory has merit. During her speech, she really seemed to be struggling to form the words, a lot of weird hesitation. I can't, however, think that the campaign would admit she is on drugs. Maybe she's going to try some kind of menopausal psychosis sympathy plea?