i know im not a profesional with snakes and i just reciently got my first snake ... but it might b mites still.. a helpful hint might b to bake its bedding (ex: aspin {which dosnt look like u have aspin.. so i dunno}) it might containe the mites, so ive been told...
then again like the others say, she coule b in a shed.. that or she/he just likes it. (my aunts BP like to lay in its water)

hope im of some help