If you read the article, it's because she has perfect memory recall, so they say it's as-if she can travel back in time, since she remembers everything vividly in great details perfectly.
I don't think it's a condition that is being debated much, it seems to have been pretty well studied, though it doesn't seem we really understand how it works or why it happens. At least based on the Wikipedia page.
Apparently the condition is called hyperthymesia.