I don't know you guys. If you look at the last two pictures full size, I think I can see a faint brown out line. I mean, for the price it probably is a desert, but still....
Do you know how old she is? That is another thing that would help. Even the best pastels get more brown with age. If she's more than 8 months old, I'll bet desert. If she is younger, there is a chance she might be a high yellow pastel.
Even if you cannot breed her, she is a dynamite looking snake. Personally, I'd never get tired of her just because she is so pretty.
Gale