I think she certainly did above 400 miles with 410-430 miles being realistic if we assume she is overly exaggerating how much time she actually spent on the treadmill. This could all be easily answered if only Millet Sports would release the YouTube links for the missing videos.
400 seems like a good benchmark. Again - we're not doubting that she didn't run a lot, but merely didn't hit the record and can't prove that she did.
But, there's a lot of money to be made in martyrdom.