Well, what I can understand is that you decided to get the pony anyway because of her colour palette which looked like Cherries Hubillee on the pic. But if I understood you correctly, she turned out to be bright orange?
The problem is, you are really not very clear about what exactly is wrong with the pony. If she is not what you expected and you don't like her, it's ok to return the pony for a refund, or to ask for a partial refund.
But getting a full refund and keeping the pony does seem like too much considering the fact that the seller obviously wasn't misleading you on purpose