I'm so sorry to hear your friends mobility is so limited, and that she can't use that way of crocheting as something of a workaround.
Like you I'd hate for her to give away her hooks and wool if she doesn't have to.
I'm sending you a PM asking some rather direct questions about the mobility in your friends fingers, hand, wrist, and arm so that I may be able to limit my own mobility to hers as far as I can to try to figure out a method that might work. You don't have to answer them, but that's my only way of tailoring to her as far as I can. I hope you do, because I really want to help if I can.
Please give her my best!