If you really like her it's not that long a trip to make. BUT, since she didn't sell since your original post, I'd be cautious. She sounds a little too good to be true--don't fall in love and bring home problems. At 6yo, if she was great, I would not be selling her. Certainly she would have some showing under her belt and pictures of such to justify the price. Weight problems with TB's just come with the territory.
Just consider the trip to be an adventure, and enjoy it for that.