But plenty of reps have been injured to one extent or another during their term. Car wrecks, heart attacks, small strokes and the like. They don't get tested.
Besides, since none of the others have ever been tested, what would you compare the results to? Does she have to be as smart and articulate as she was before the shooting? Do you have some sort of repeatable test that has that info? Or does she just have to beat Sheila Jackson Lee?
Does she have to be able to articulate which islands won't capsize? Correctly guess how many states are in the union?
Seriously, you're calling for testing with NO standards either for her before the accident or any baseline requirement for the job. Even if she took a test the results would be meaningless.
Do you have any evidence that she's mentally changed? Have her votes showed some radical change of since the shooting? Is there any evidence at all that her constituents aren't getting the exact same representation?
What's the point, other then you don't like her recent votes?