You can ask her to touch the right or left corner ... or copy the form from left to right for yes and from right to left to no.
We have an accelerometer. So that we can tilt it in different ways or rotate it. Or knock it once for yes and twice for no.
You can use voice commands. You can use the camera as input. For example, display a red card for no and gree for yes.
You can even use NFC tags ... or connect large hardware buttons or some kind of keyboard ...
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