In what part of Germany you're in? Get in touch with
$1 a communities for low vision and blind in Germany theres 3 month small payment fee for membership but you get lawyer help, price reductions for helpful aids, community meetings for support and special events, help with arranging aid in professional training, she will get monthly magazine in special CD form DAISY still popular in elderly here in Germany and device to play it can be fully financed by Krankenkasse.
Maybe here you find something helpful:
$1Fill out papers for Schwerbehindertenausweis - disability ID if she has it already it has to be updated.
Does she has any vision left?
Use tactile bright neon marking points for buttons. Does she likes books? Buy her cheap CD player and mark buttons: play, pause, back, next, open CD. Nowadays audiobooks on CDs are quite cheap sometimes in KIKK I find lonely audiobook for only 0,50€! Burn audiobooks to CDs. Use converters to make ebooks into audiobooks.
I doubt she would be able to learn any modern touch based device like a tablet or smartphone its easy to us but for elderly its pure magic and too much steps to remember with awakened gestures. There are courses for elderly but I doubt their quality and they're for people with good vision.
I'm from Germany too.