Queen of the Not-Rights
Short answer: No. And as Ron pointed out, if the exclusion is FOR a broken hip, why in the world does she want it changed?....Is there no way to just get the CoD changed by someone other than the original doctor?
And the survivor benefits aren't going to change because of the nature of the CoD if this is for his military pension. Is there any way your MIL would sign up for an account here? Because there are answers to questions that you're not going to know.