>>>>Is she wide-bodied with mutton withers?<<<
No, I wouldn't say she is really mutten withered. What I need to do when I have the saddle fitter come out is to have some endurance type western saddles here and have her fit them and see if I can do somehting with a pad and fixing the bad spots. Like I said it would only be very seldom it would be used (1 or 2X a year??)so it wouldn't have to be a perfect fit. Of course I will strive for that.
