I don't think that will wash with the UKBA I'm afraid. She herself would have to have a health conditoin that meant that she would be potentially harmed by her removal.
Presumably you were able to get by being partly disabled before you met your fiance and the UKBA would probably take the view that (this being the case) it would not prejudice either of you to insist that an out of country application should be made. I would not advise applying in the UK because of this. They would reject the application keep the applicaiton fee £820 and she would be forced to return home to make the application, with the further application fee.
Trust this clarifies, please click accept. Kind regards,Tom
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