Congratulations!
I don't think you can outguess food allergies in advance. Dogs are like people--they can be allergic to literally anything. And hopefully she won't have any issues at all. If she was doing okay on the Nature's Select then I'd probably continue with it. If I wanted to go with something else I'd probably choose a more limited ingredient food versus one with a very long list of ingredients. That way if she reacts to something you're in a better place to start your detective work. Same is true for treats--simpler/fewer ingredients is probably better.