Not worth it. She will be turning down a well ranked program, spending a ton of money, and making it hard to come home. Plus, the truth is, it isn’t like a tropical island there – you can’t just put on your mask and flippers and go. It takes some time in a boat to get to the reef. I don’t think it is the experience she imagines.
Or, she can just go on exchange, even if it costs you some money.
Save it for grad school.