You have been getting some conflicting advice, which is only natural. Different people have different methods, and more importantly, the dogs are different. You have to decide what will work best for Gracie. Based on what you have said, here and other places, it sounds to me like she is a combination of my first grey, who was very timid and shy, and one of my current girls, who isn't timid, but is extremely devoted to her routine. Example: Molly loves to go for walks, but only in our neighborhood where she is familiar with everything. She loves to go for car rides, but if we get out somewhere new, she refuses to budge. Anything new is met with great suspicion.
So, I agree with the answers that say, time and patience. If she does ok in the morning, just walk her in the morning for now. I like the idea of randomly putting on her collar and leash in the house, treat, come back a little later and take it off. That will desensitize her to the whole "getting dressed" part. I know it is hard for you as a vegan to deal with meat, but remember, Gracie isn't a vegan Try a few different cooked meat & cheeses to see if one really appeals to her. Molly will walk on water for bacon, and all mine adore roast turkey (the deli slices). She is still pretty overwhelmed with all the changes in her life, and it sounds like she is one who takes some time to adjust to any change.