At this stage there is nothing that can be done about the box. If they were to try and clean it it would spook her into possibly flying and she is not ready.
As I keep saying, they are bringing in food enough to feed 3 or 4 and there is just her. the box has been messy before but never like this.
If it is any consolation she tends to sleep at the very front where it is cleaner.
she is doing a good job on self feeding and I am wondering if she is a he but we will have sot wait.
I am going to go back and look at my pictures from last year
In this shot if you did not know you would think an adult is in the box... It is not clear but...
I sure hope I am going to be able to tell after she fledges who is who.