Other than the fact that she has MS, which is certainly a struggle no matter what, her life has been remarkably easy. And even with the MS she has been very lucky. After all she always has the best medical care and medical bills aren't keeping her up at night, nor are worries of what she's going to do when the MS is so bad she can't work. Which are things most MS victims suffer with all their lives.
She has nothing in common with your wife, so stop giving yourself airs.
If I were wealthy and my wife had MS, it would be a very difficult struggle and hard. If I were poor and my wife had MS, it would be MUCH worse, especally if we did not have insurance.