Awwww! She's gorgeous. Congrats on saving this one.
I would probably give her the week of rest in her new home. She's probably just checking it out. Feeding too early might stress her out into thinking there is something living in there with her. She might just be a curious one.
Some of mine come out as soon as they here the door open, and others..... well they could care less if an earthquake hit. They just want to sleep. Lol.