Thank you everyone, for your encouragement about Gracie. She is still scared, but showing gradual improvement. She spent some time in the cat cave I made for her out of felt and polar fleece, pattern link here, she's allowed me to pet her a bit, and she's done a little exploring when we aren't around, but she has spent the majority of her time under the bed. This morning, Steve and I went out for coffee and scones, and when we came back, I couldn't find Gracie. Turns out, she was in the sunroom, under the couch. Feels like progress to me! I'm sure I'll have to leave the house so she can make her way back to her room, but that's okay. Baby steps.