Don't know that board... Wiredsport probably is the right one to ask (be prepared to measure your wifes feet with a ruler cos he - rightly - won't accept "size 9" as a measurement
and also be prepared to probably buy her new - smaller - boots rather than just the board.)
However, if her feet actually are 26.5cm (Mondo size for a womens 9 according to Deeluxe), she may be one of the few which actually gets the well overhang at the inserts which Wiredsports recommends, cos my 24.5cm feet on my 152 Jones with the same waist width as that YES are 3cm shy of any overhang at my stance n angle...
However, if her feet actually are 26.5cm (Mondo size for a womens 9 according to Deeluxe), she may be one of the few which actually gets the well overhang at the inserts which Wiredsports recommends, cos my 24.5cm feet on my 152 Jones with the same waist width as that YES are 3cm shy of any overhang at my stance n angle...