Fromm and Orijen are very rich foods. especially if she was previously eating something more low-middle ground. many dogs do not do well on the "premium" foods because of this (too rich).
And yes some dogs do terrific with grains. not all dogs need grain free.
This thread may offer some suggests/info on what people are feeding.
https://www.lab-retriever.net/board/d...2085-feed.html
I am feeding Go! Turkey with now.