Dehydrated fish sounds like a great treat to give to her! Pancreatitis is not something that you really want to fool around with...take it from me, I'm still recovering from major surgery to have almost half of my own pancreas removed nearly 4 months ago. The orange colored stool can indicate a flare up of the pancreas and the orange color is bile, nothing to worry about, it will clear itself up. However it is important to keep inflamation of the pancreas down, and when you stray outside of her regular diet the pancreas can become inflamed causing an attack of pancreatitis. The immediate problem with this is the extreme pain that accompanies an attack, but the really serious problem is that with every attck of pancreatitis the risk of scar tissue on the pancreas gets higher, and this can lead to problems such as diabetes and insufficient production of digestive enzymes, which requires daily medication. The pancreas is a vital organ, and works the same in both dogs and humans. So take it from me, that treat you want to give her is not worth the problems that can occur. I even had to give up chinese food which is my all time favorite because it truely was not worth the damage that it created or the potential trip to the ER with full blown pancreatitis which can be deadly if severe enough. I'm one of the very lucky ones, the cause of my pancreatitis was a tumor that was successfully removed, but your pupper probably will have to live the rest of her life protected from the foods that can harm her.
Ask your vet about raw bones, but because you have her on a fish based diet I suspect that beef bones would be too rich for her (red meat is especially tough for pancreatitis and IBS). You could always do the whole teething trick and take a towel maybe wet down with chicken broth if she is able to have that and freeze it, it would help clean her teeth. Another delicious treat would be to make FAT FREE frozen cubes of yogurt and give them to her as a special treat, again if she can handle dairy, but it is usually the dairy fat that causes a problem. Goodluck! I know that it is not an easy problem to deal with, and I hope you come up with some good solutions.