How old is she? I've been considering teaching my 15 year old org-mode.
My big gripe is that most of my task management and notes are done via my phone or tablet like a clipboard, and management of plaintext on these kinds of devices tends to suck versus the UX of say Todoist with widgets to display tasks on a launcher. But the likes of Todoist are appalling feature-wise.
What I really want is the concept of preceding and blocked tasks, and to only be able to surface currently actionable tasks. AFAIK, TaskWarrior can do this, and IIRC, similar can be done with Org-Mode with TODO dependencies.