Sounds like my dad... He went from being OK using a computer to not being able to use it at all.
I'd go visit him on a Sunday... We'd spend 30 minutes with me showing him how to compose and send an email...then we'd go to another room and chit chat for an hour... I'd mention it was time for me to go and he'd say he wanted me to help him with something on the computer-> How to send an email
This went on for months.... I'd just humor him and do the best I could... He was a big note taker since he forgot so much.. It really got to him when I dug through his notes and showed him all the steps he had written down.
He eventually bit the bullet and quit turning the computer on.
You might want to try and talk your friend into getting one of those simple phones with the huge numbers so she can call people.
You might also want to read through other posts here so you can see you're not alone.