I like this idea. Now this one is for a lap top but you could reduce it in size to fit her cell phone in the front pocket & have the zippered section for a small notebook. Now how to keep it within reach but not in her way is something I'm not sure I can help you with. Does she use a walker? Maybe you could add a velcro tab that goes around the walker that it could hang from. Same thing if she is in a wheel chair. If neither of those options & she is still very mobile, maybe an over the shoulder strap would be good. I'm just throwing out suggestions that might ring a bell for you.
https://blog.createandcraft.tv/debbi...p-bag-pattern/