The fact that only one hair was found implies to me that many more hairs were initially present which either got vaccumed up, picked up or sent out as gray/black water. It also implies that someone attempted to remove them. If she was only there a short period of time its not likely a hair would be left and less likely it would end up in the trap.
Add to that two other unlikely events and the explanation she played there strains reason.
Add to that two other unlikely events and the explanation she played there strains reason.
Many of us posting here have shared various experiences we have had as 7 Y.O. children (or so), that included playing in neighbor's boats, trailers, garages and even cars. Others, have shared experiences, they have had with neighbor children playing in their RV's. So frankly, minion, it's difficult, for me, to understand why it "strains reason" in your particular case.
As for your implication that someone tried to remove Danielle's hair from the MH, that IMO, does tend to strain reason. There was hair, of all types, found throughout the MH and much of it was varying shades of blond. If you can explain how you hypothesize, that DW selectively found, identified and disposed of only Danielle's hair, I would be very interested in hearing your theory.