How large? I have a samsung galaxy note, which is a cross between a phone and tablet. It is 5.5" X 3". It takes some getting used to because it is bigger than a regular cell, but still fits in a pocket. I bought it because my eyes are not what they used to be and I can see the text much easier. I also like the feature of the stylus pen (included) to type because I never got used to the touch keyboards. I think my fingers are to big. It is more like a mini computer than a phone and you have service no matter where you go. They are fairly expensive unless take a 2 or 3 year contact. So it depends on what she will use it for. If it is only texting it may not be the right choice for her. I am sure there are tablets out there that can accommodate texting.

thank you for the brilliant idea of the stylus pen, I may be able to rig something up with a lap top

What about a tablet instead of a cell phone....much bigger and easier to see than a cell phone. Good luck with your search.

GM1