Probably macular degeneration. Pretty common in older folks.
I have two suggestions, first is to contact her state's blind services program and see how they can help. South Dakota has people that will go out to people's homes and help them find ways to live independently. They also have a CCTV magnifier program where people can rent or borrow a unit rather than buying one out of pocket.
If she is open to buying something, I would have her contact her eye doctor or her low vision doc (if she has one.) Many low vision doctors sell magnifiers, her state's Assistive Technology program might too.
FWIW I work for the SD AT program and low vision is a huge part of what we do... here are some companies I would check into for equipment:
Enhanced Vision is a manufacturer of low vision products to assist with low vision conditions like Macular Degeneration and other visual impairments.
www.enhancedvision.com
Optelec develops products for low vision, visual impairment. The Optelec low vision products help the visually impaired to live an independent and full life.
us.optelec.com
www.freedomscientific.com
Browse our selection of high quality Video Magnifiers! From Hand-held to desktop magnifiers, Eschenbach offers a range of electronic devices for the visually impaired.
eschenbach.com