i am not sure what you mean by "ridicule".... ridicule because she isn't "strong enough" or she is just "another dumb ortho jock".....
granted, statistically, there are more males than females in the surgical specialities. there are a variety reasons for that, which is in another post in itself.
having gone through the match this year as a XX, i was pleasantly surprised by the number of females that i met on the trail. on top of the fact that every guy or gal that i meet were super-friendly, incredibly nice and would loved to have them all in my residency program. to match in ortho, you have to be in the top of your game and class. all the folks that i meet on the trail were all smart kids who decided ortho because they loved the field.
as to the strength issue. granted, a 100lb gal isn't going to be able to have the brute strength as a 200lb guy. but realize that relocating hip joints isn't about brute strength. if you don't understand anatomy and use it to you best advantage as to when to flex/ext/abduct/adduction to get the hip back... you will be spending a lot of time with that dislocated hip.... no matter how strong youare. oh, did i mention the power tools? all you have to do is press a button.....
if ortho is what your wife wants to do, encourage her and be her best cheerleader. people will say what they want. but as long as she has a good attitude and aptitude, they can only say good things.