ok. You have been given some great advice and I would one add that diner time is your best friend from my experience. All of my rescues had to learn trust; mealtime is a great way to gain that trust. I would recommend making her eat out of your hands no matter how long it takes. Sit on the floor with her and try to feed her (I usually took a different position than sitting on the floor with the Great Danes because some of them I worked with were at first a bit unsettled and more than just nervous), if she resists take the food way and come back maybe an hour later and try again. It took me several months with my rescues that were abused to get them to take things out of my hand, once they started taking the food out of my hand I would then give them their bowl but they had to initally take something out of my hand before I handed over the bowl to them. Bacon bits is usually a high value treat that works nicely to get them to eat out of your hand. Patience will be key; a nice quiet environment and she will come around, just keep the faith and good luck! She is worth it, just give her some time.