Ooo, I know this. Okay, she has to be very careful with both meat and vegetable proteins. Sodium is a huge problem. First off...
For rubs in this condition, there is no better product than the Sodium-free products from Mrs. Dash. They cook up great, and actually taste great as well. I am very fond of the Original, Lemon Pepper, Table blend (finer grind) and Steak Grilling. These really complement vegetables quite well.
In terms of vegetables, I like to work with squashes, mushrooms, sweet potatoes and potatoes to add body to dishes. You can use these either as bases for plating, or as binders, meaning no eggs or milk. They work great for that purpose. I like to use leafy greens for bulk, chard, kale or cabbage all work great. Celery in small amounts can be a real friend, as it adds a small amount of salt taste without being too strong.
Topping with a flavorful salsa or sauce, this is where you can punch up flavors and brighten a dish, one of the issues with a kidney friendly diet, is that it become muddy and mushy. So, how to pull it all together...I might try something like this.
Base Cook:
take a large sweet potato, roast on cooker until 90% done, remove, Slice three or four thick ovals, coat with a little olive oil, then liberally coat with Mrs. Dash Lemon Pepper, lightly dust with Turbinado sugar, return and grill to caramelize surface.
Vegetable Cook:
1. Take 3 or 4 dried shiitake or equivalent dried mushroom, soak for 15 minutes in warm water, filter water, take mushrooms and simmer in 1/2 cup white wine and soaking water. Slice and set aside.
2. Grill up some zucchini, some yellow squash, some carrots, slice into shreds. Place in a pan with some Swiss Chard (cast iron works great here) and the sliced mushrooms. Let cook for 15 minutes. Add back in the mushroom reinforced wine and adjust/season with vinegar and Mrs. Dash Table Blend.
3. Top the sweet tater slices with the vegetables, top with a quick salsa, no salt of course, it could even be a fruit salsa (mangoes, oranges, apples etc...) a dash of fresh herbs. This would be so light in terms of protein, you could even sneak in a little sour cream on top.