Yes, I made that observation before anyone else here. But who would leave the steps out when not in use ?
So, added to the long list of not likely happenings, the RV needed to be left unlocked by someone who is so anal he calls his son to check locks, the RV steps were left down in spite of having complaints from neigbors, and a small child needs to be on her own in the neighborhood, and no other child ever entered and no adult ever saw it happen.
But I agree it is theoretically possible all that happened and possible she left a fingerprint, a hair, blood and at the same time smeared fibers on herself that lasted months until she ws found.