Travelling abroad PLEASE HELP

My daughter will be 18 in February and is super into dog training and she gone on a few seminars in U.K. But she has seen a trip to Ohio which is 14 hour flight two stops and 4 day seminar. She hasn't even travelled on a bus on her own but to be fair anything dog oriented that she is totally fine. Due to cost I won't be able to travel with her so my question really is should I say no or should I encourage her. Also does NAS know of chaperones or any assistance she can have whilst travelling. I'm thinking no you can't go it's too far but at the same time I don't want to spoil her dream as its her dog training idol who she saw last year in the UK