Is that conclusion based on another statistical model? Exactly how many fingerprints, exactly how many hairs,and their is no proof there was any blood.
She would have had to play there a long time for her to drop enough hair that one finds its way into the trap. That would give her enough time to explore. A kid who entered the RV would open every door and most every cabinet. I would expect there to be 3 or more at least. Even so, I cannot come up with a scenario that combines all three. Hair with root, fingerprint and blood or blood like subtances. Two maybe, but three puts it into never never land statistically.