Just curious: is the problem you relate your companion having with "heaving the gun to her shoulder" a pure problem of weight, or is it that the gun is front-heavy? I've run into a number of sxs (usually at the lower end of the price scale) where the gun was light in absolute weight, but was so front heavy it seemed like it weighed a pound or so more. FWIW, I've always shied away from the O/Us because they seem, to me, to carry heavy - a question of balance fore and aft. That, and the CZs seem to be front-heavy across the line, probably as a function of the way their barrels are built to accommodate choke tubes (assuming her gun has them).
Rebalancing the gun by dropping some lead under the buttplate might help some, and that can be done at home with a power drill and some recast wheelweights.
Also, re her proportionately-smaller hands and DT, it's worth remembering that (at least in my experience) French and Belgian sxs seem to have grips which are more svelte than other nationalities'.
