I agree that she should speak to her tutors ASAP. They will have lots of suggestions for her, and will be willing to offer her support in order to help her carry on with the course.
However, if she really doesn't like where she's living, then she probably isn't going to be happy at this uni. Being miserable won't help her perform well. Is there another uni she could go to in a more rural location which she could transfer to for second year? It sounds like a pretty specialist course, which means less unis will offer it, but there might be another place she would prefer living.
I think you need to separate the issue of her boyfriend from the issue of the course. Lots of students at uni miss their boyfriends, but they usually still enjoy their course and have a good time. If the course was a last minute decision, and she's changed her mind again, it might be better to drop out and start over.
It seems like there is some pressure on her coming from you and her dad. Does she feel like dropping out is not an option because she has always done well at everything? I'm also not sure discussing her possible plans with everyone and agreeing what a mistake they would be is helpful. Why do you feel the plan of the outdoor pursuits course is a mistake- because it is not academic and she would not be living up to her "potential"?
Not every person who excels academically will enjoy studying a really academic subject, or indeed will enjoy uni. I think the best thing to do is just let her know you will support her whatever she chooses and give her the option to drop out and think about her future if that's what she wants. Perhaps you could write her a letter- let her know that she won't become a disappointment by dropping out, and she is only young and allowed to change her mind.