In Slytherin's Read-A-Long we're on Chapter 18 of the Goblet of Fire, "The Weighing of the Wands." Ollivander notes Krum's wand was made by Gregorovitch, and obviously Cedric and Harry's were made by Ollivander. But he does not say who made Fleur's, he only says "I've never used veela hair myself" which must mean he didn't make it.....so who do you think did?
Here are the known wand-makers:
Ollivander Family (including our own Garrick)
Antioch Peverell/Death (No one knows for certain how Antioch came to possess the Elder Wand. Although Beedle the Bard claims that Death gave it to him, others, such as Albus Dumbledore, theorised that Antioch created the wand himself)
Salazar Slytherin (made his own)
North American Wandmaker
Could it have been one of them? The core of Fleur's wand is veela hair from her grandmother, so maybe someone in her family makes them?