What Carrier is she with? For Verizon we have a couple of phones I think would work... The Accolade VX5600 is a Flip phone with large buttons and scalable fonts. A very simple entry level phone. The other one is the Cosmos VN250 which is a candy bar with a slide out QWERTY keypad. The Buttons are not as large but the Font display is about the same. We also have one for MetroPCS that I think would work, and one or two for Sprint.
I would look for the international version of the VX5600... It's an entry level Flip phone which has scalable fonts... I'm sorry I don't have a catalog listing the international models, but see if the LG Store carries the GB110.