Thanks for the additional information. It is helpful. You may not want to hear this but it sounds like she is training you.
You will need to get some nutrical from the pet store or your vet office. You will use this to provide her with nutrition when and if she refuses to move to go to a bowl. You will then put her food at least 3 feet from her bed and leave it there. Don't watch her, just put it down and walk away and go about your normal routine. If after a couple of hours she has not eaten, give her some nutrical. It will keep her from becoming hypoglycemic and supply her with the necessary nutrition that she needs but not fill her stomach. It may take her a few days but she will get hungry and move to eat. Once she is eating, gradually move the bowl further away from the bed.
Do not try and coax her out of the bed. Of course, you will need to take her out to eliminate but otherwise let her be. She has to learn that you do not mean her any harm and she has no reason to be scared of you. In addition, I would put a harness on her and leave it on her. If she was found in a costume then she was used to having item on her body. So put the harness on and let her wear it.
Once she is moving around with the harness to get her food, then you will want to give it a week or so and then attach a leash to the harness and make her drag the leash around. Make it a short light weight leash to begin with. She’ll start to move around with the leash. If at any time she doesn’t eat at least twice a day, give her the nutrical. Once she is moving around with the leash on, then you can start working with her in earnest. Then you will want to start obedience training with her.
Obedience training serves a few different purposes. Obviously it teaches a dog commands which allow you to control the dog. However, it also helps a shy or scared dog gain self-confidence as the dog learns that when you stay a certain word, you want them to do a specific thing. They naturally become less fearful once they know what you expect of them. It also establishes you as the boss. Dogs respect the boss and it is their nature to obey the boss even if they don’t want to. All of these things will help her learn to trust you and be more open to becoming your true companion.
The following site is helpful in helping owners train their dog. Be sure and click on the link to the page on obedience at the bottom. and links on subsequent pages leading to detailed instructions.
Training works best if you train at least 30 minutes a day (two 15 minute sessions). I would start making your dog work via the Nothing in life is free program (NILF). It is outlined below.
This isn’t going to be a quick fix but it is the best way to get her used to not only her new home and you but to also become a well adjusted dog as well.
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Since there have been recalls on certain foods, please check the following site to be sure the food your animals eat is not affected. If it is affected, contact your vet as soon as possible. Have your dog seen if they have any symptoms.