Hello, based on the facts that you provided in your post the exemption doesn't apply, unless her disability prevents her from taking the test, there is no way around it.
Any way the test is not that hard and you don't really need to to be fluent in English to pass it.
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Not on the facts you give.
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There are several exceptions to the test taking requirements which may or may not apply to your aunt. Speak with an immigration attorney locally for more information.
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The medical disability exemption is for medical conditions which prevent people from being able to take the test. None of the conditions you describe appear to indicate a mental condition which prohibits her from learning English.
While this answer is provided by a Florida Bar Certified Expert in Immigration and Nationality Law, it is for general information purposes only and an attorney/client relationship is neither intended nor created. You should seek out qualified counsel to review your case and provide you with advice specific to your situation. Call +1-561-478-5353 to schedule a consultation with Mr. Devore.