Leslie, don't go blaming yourself! You are trying your very best, and I know how big your heart is. Just keep in mind that it has been less than a week. When I first brought Kylie into my home it was over 24 hours before she used her litter box. I remember being so happy when I finally saw the leftovers!
I have a feeling that after she is in her room for awhile, she will relax and be able to get comfortable. I don't feel you are doing anything wrong!
You are in my thoughts and prayers.