If she is familiar with iPhone, she will be right at home with iPad Pro after some small adjustments. As for being foolproof, it is about as foolproof as an iP

If she is familiar with iPhone, she will be right at home with iPad Pro after some small adjustments. As for being foolproof, it is about as foolproof as an iPhone is. So if you count iPhones as foolproof, then you should be good to go. MacOS, for all its good, is an entirely separate beast, and she will essentially have to learn a new OS, with all the caveats that come with it, not even mentioning foolproofness and such. For your specific scenario, sounds like iPad Pro is the better of the two options.