What it can doKeep her lean.
Bodyweight is the one thing in your control that veterinary medicine is most confident about. A lean dog carries less load through every joint and every breath, for life. Portion accuracy is most of that, and it is easier with food you measure than food you pour.
What it can doMake the bowl legible.
One named protein and a short ingredient list means that when something stops agreeing with her, there is a short list of things to change. That is not a cure. It is a shorter road to an answer, and shorter roads cost less.
What it cannot doBuy you a guarantee.
Genetics, accidents and luck do not read ingredient labels. Any brand telling you their food prevents disease is making a claim they are not allowed to make. We are not making it. What we are saying is narrower and, we think, more useful: better odds are purchasable. Certainty is not.