The point of uni is study not The Curse of The Experience (as we called it, shortened to The Experience).
I lost track of the number of students I'd see who would come to me in the first weeks or months and say they wanted to swap to something else, minimal digging would result in discussion about The Experience. I came to the conclusion a lot of students and possibly schools and their families are wrapped up in The Experience and so totally miss the point.
The point is to study, to gain qualification to get on in the world of work. Graduate schemes don't always specify a scheme but students need to show they're committed to a scheme via other study/extra curricular activities. Yes students can change their minds, I did.
So many, more than you'd imagine, drop out because of The Experience. To begin with its all very exciting and lots of clubs, new people etc but that wears off, quickly and students can find themselves far away and feeling totally lost.
What's so different about the other course? Where will that lead her? If the answers are don't know and don't know then she isn't ready.
Finally, It's not only about the cost, though that's a huge thing for many, it will effect her self esteem and possibly mental health doing a course her heart isn't in, ultimately effecting her grades, or darn causing her to drop out. Yes she can, if money no object, study again BUT it isn't as simple as just reapplying, she'd be asked what happened with her first course and likewise with employment.
I think you need to have a serious sit down and chat about this. Not The Experience. But The Reality. She's going to study not for the rest of it. It definitely sounds like she needs a year out to find herself and what she wants, no shame in that at all. I understand she's living somewhere small and has a form of cabin fever but again that can be a recipe for disaster as well as she may be romanticising living in a more populated area (everyone does that, grass is greener etc).