I can only comment from our experiences here with a (not so smart!) 3 yr old LG TV with a sat tuner. After a few attempts to get the tuner "tuned in" with the "rather complicated" remote, I simply gave up because the damned thing has so many options that I can't even be assed to try to remember. And if I gave up on that then my wife would stand no chance of even starting to learn how to use that damned r/c - that's why, a few months ago, I asked forum members if anyone could point me to a current model TV with a simple & straightforward to operate r/c, but no-one could!
(did that in case I become incapacitated to the extent that I couldn't operate the current set and so she'd have to do that - which she almost certainly couldn't if anything went slightly wrong - like it changed "spontataneously" to another HDMI input or one of the DDT channels of it's own accord, as has been known to happen!)
That's why, almost since we got it, we've used the TV as just that, and get all the programming from the SKY+ HD box via the DENON, which also allows easy switching to one of the other sat receivers or get streaming content via a ROKU II box connected to the internet. My wife can deal with everything she needs via the SKY+ HD r/c and she never has to touch the actual TV r/c. Of course, this is in the UK, is only for UK-originated sat transmissions from 28E - your requirements may be slightly different??
However, to go back to your original question, I think you should take your wife to an actual TV shop/retailer and get them to show her various sets with sat tuners and how they are operated, and then get her to try those out to find one she likes and can "live with" - I certainly would not buy one mail-order and simply hope that she will then be able to operate it!!!