it could be the validity of her passport. my mom got 8 years instead of 10, but that's only because her passport wasn't valid for 10 yeas.For my mom's super visa she did not undergo medical exam. I don't know if that's the reason they only gave her 3 years instead of the 10 year visa as per the website.
requesting medical is completely up to the officer reviewing each TRV file, but i dont think they would give u less time because of her health, if there was a concern, they would just reject the whole thing.
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