There seems to have been some consensus among the fandom that Fleur was last place in the first task. However, we actually don’t know that from the books. We know that Krum and Harry were tied for first, but the placement of the other two wasn’t given.
Her being last into the maze doesn’t help narrow it down because her 25 point 2nd task was so bad for her that even if she had gotten full marks (50 points) in the First task, she would have still trailed with 75 points to 3rd place Krum who had a combined score from the first 2 tasks of 80 points.
Therefore, the only constraint we are given for the First task is that she had less than Krum and Harry who had 40 each. We also know that Cedric had 38 because he had to overcome 2 points to tie with Harry at the conclusion of the 2nd task. This means that, according the books, it’s very possible that Fleur had 39 in the first task which would put her ahead of Cedric and only behind Krum and Harry.