>>Neither of us can read the fonts on our phones.
>>She'd need at least a 15" screen.
My 80 year old neighbor enjoys her approx 10.5" tablet. KG will laugh, since it's an Apple. But cost value = Android is the one to beat.
FWIW Acer, Sharp and others all came out with 15.6" tablets in 2014-2015 but soon shelved them in favor of 9" or 10.x" that seems to be the sweet spot. But if it's not enough, check out the glorious 18.5" Galaxy View.
"... They ne'er cared for us
yet: suffer us to famish, and their store-houses
crammed with grain; make edicts for usury, to
support usurers; repeal daily any wholesome act
established against the rich, and provide more
piercing statutes daily, to chain up and restrain
the poor. If the wars eat us not up, they will; and
there's all the love they bear us."
-- Shakespeare: Coriolanus, Act 1, scene 1