Though not likely, it is possible the tiller profile is correct for her. How is the bow designed? Same length limbs or shorter bottom? Does your wife shoot split finger or three under?
A bow's braced profile should be a RESULT of how its relative limb strength at full draw meshes with the archer's holds in bow and string.... not the other way around. In glass laminated bows, things are much more predictable.... and the braced profile is a better indicator of how the bow will react to being drawn a certain way... not so much with organic bows. In my organic bows, selfbows, backed, and composites, the tiller profiles that result after timing the limbs ranges from slightly negative (weaker bottom limb) to slightly positive... with most being closer to equal.
Ultimately, what matters most is how the bow balances at full draw in her hands.