She's a beautiful horse, but I think for that price, you could probably find something trained or at least with some saddle time. She definitely needs a lot of "manner" training, but with the right person that could come easy. However, if you haven't dealt with a young horse before, you may need to pay a trainer to help you out. Also, unless you are planning on training her yourself, you will have to put out more money on top of the $6,900 for professional training.
Conformation wise, she looks like a beautiful horse! I guess what it will really comes down to is whether you want to spend that sort of money and whether or not you'll be able to get a mature, trained or started horse for the money you'd be putting into this girl. In my honest opinion, nealy $7000 is a lot to spend for a two year old crossbred horse, but if it seems to have a lot of potential, I'm sure there are people out there willing to spend the money.