In this account of the day's events,
http://www.telegraph.co.uk/news/uknews/1562817/Madeleine-McCann-Confusion-over-last-hours.html
they've chosen a photographic timestamp (easy to set a camera's time or date incorrectly, on purpose) as the last point at which Maddy was seen, other than via the McCann's say so that she was still alive. Hopefully, this was merely editorial choice and independent witnesses did see her, that day and it is all there in the police evidence.
This is necessary to eliminate the possibility that she came to harm the previous night which would have required them to, somehow, bluff their way through the supposed day of disappearance, explaining away the childrens' absence, repeatedly, which would have been tricky.
The witness accounts in the rest of that article disagree with each other like some detective drama. Short of visiting in person, working out who could see which part of which street from what viewpoint cannot be worked out just by reading about it, so I shall not comment.