I put in a post about post feeding behavior and just behavior of snakes. When I got my little girl seems to be the same time you got yours. Wed. of this past week.
What she does is about just after dusk go crusing around the viv, I watched her for about 3 hours just investigating the whole viv, she made me tired just looking at her. Durning the day she hides under the paper towel, I can see where she is at dispite the aspen substrate.
But you have to remember each snake is different, my green rough crusies durning the day and her at night, so It makes up for it I suppose.
I notice her movement has be much lower snice feeding time however.
I have yet to see any post where newspaper has affect snakes.. I have just about read every post on this forum. I think your snake would be okay, if your really worried get paper towel and use some aspen substrate, That's what I do.