You should contact blindness organizations. If you live in the US, I'm sure that they will have people who can teach her Spanish braille. However, I don't think libraries for the blind in the US have large collections in Spanish.

A better option is for her to learn to use technology like an iPad with accessibility tools. Again, blindness organizations would be the best people to help you with this. She could get audio books using technology.

Braille might seem like the answer, and is a fantastic tool to have at your disposal if your Abuela is motivated to learn, but there are other things she can learn which may not seem so overwhelming and can give her access to lots of reading options. Sometimes older people have a huge mental block when it comes to learning braille. The fight to convince them it’s worth it isn’t always the hill you want to die on unless they have already decided that’s something they want for themselves.
Screen readers have Spanish options and would allow your Abuela to make phone calls, text, search the internet and listen to books, all in Spanish.
Audio books have Spanish options depending on where you are located. At my organization in particular, one of our instructors is fluent in Spanish and would be able to help your grandmother with all sorts of independent living tasks to help her be successful without vision.

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