Very nice pedigree indeed! I'd take that for a barrel horse prospect any day.
Overall, she looks decent conformation-wise ... except that hind toes out like your mentioned. I guess I don't know either how much it would affect her. Personally, it doesn't look that bad as she still is fairly straight through her hocks and they are not turned out THAT far. But I do think your best bet would be to get a farrier's advice.
And if you are spending any decent amount of money on her anyway, a pre-purchase vet or farrier exam might be worth the little extra money in the long run.
My mother's horse is toed out in the back, similar to how this horse looks, and she's never had a problem with barrels or gaming.
If you can see this horse moving, that might help give you some more information too.
∞•*˚ Βгįťţαňγ ˚*•∞
It is not enough to know how to ride; one must know how to fall.