I am the queen of hiding snakes as you are "not supposed to have animals in the dorms". Just so no one jumps on me for this, I can guarantee no one cares. The people come in for inspections and before they look around they ask us to make sure we have hidden everything we need to. It is just school protocol so no one has any crazy allergic reactions to animals. Who is allergic to snakes anyway? lol

If I put a tub on carpet, I always put a peice of foam board down underneath it. It just makes it easier to move around and keeps it from radiating all of the heat into the ground. Right now I am keeping them in an armoir because it was getting too cold under the bed (by the window). They are fine in there. :3

She will be fine as long as it is a temporary thing. If she is under your bed, I assume some light will filter in so it won't be 100% blackness all the time.

Good luck!