Sure, there are lots of theories about where Hillary's been.
My bet is that she'll come back into the spotlight looking, um, better than she looked in say, 2000 or even 2008.
The rumor was that just before she ran for president the first time, she and her daughter had surgery. Sure enough, you might notice that Chelsea's chin and cheeks mysteriously materialized while her nose, um, shrank.
From Plastic Surgery Hits:
Others speculate. Like here.
I make no prognostications.