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K3.
You already know she liked the K1, and the K3 is like that but better.
The K4 non-touch has a totally non-replaceable battery. Not even factory-replaceable. We already know that your Mom keeps this kind of device long enough for that to be an issue.
The K4, touch or non-touch, is too new to know if it has a high frequency of repair. We know that the K3 is good.
Also, units from the tail end of one of these production runs are likely to be more reliable than those from the start. That means K3.
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