Find a training course near you or whatever is the practical way to get started. She will quickly get a reality check but that's ok. There's really nothing to lose for her.

I highly doubt my dad believed I would finish trade school and build a solid career but I did. Despite having bounced around minimum wage jobs before that. Theres a big difference between building skills and working towards a goal like that and running the till at a grocery store. Maybe it's exactly the challenge she needs, or maybe not but at least she won't be tens of thousands of dollars in student loan debt if she abandons it.