I would feed plain chicken and rice, and eventually (after the allergies have calmed down) add in other ingredients one by one so you can see what she likes and what she can digest best. Almost all dogs can digest chicken and rice well, and it is a balanced diet. For extras to add in later I would include: carrot (most dogs love lengths of carrot, although it takes practice to hold them properly for chewing), broccoli, fish (just whatever you're cooking for yourself) and most other veg. I tend to add in whatever veg is being prepared for dinner (for humans) to my dog's dinner, as it's easier and ensures he gets a nice balance (assuming the humans get that). Also, I feed table scraps into the bowl, but only proper food that's been left from picky eaters and not bits no one wants to eat. You could pick out leftover foods that she enjoys ad add them. Keep in mind though that as with humans, dogs with an allergy are more likely to have other allergies so she could be allergic to quite a few things.