Princess Claire and the Watercolored Pony

Is it wrong to want more?
Princess Claire has a wonderful horse named Diamond. But when Claire sees the watercolored pony everything changes. Despite having a beautiful horse already, she is awe-stuck by the magical colors of the pony.

Claire decides she'll ask her father, the King, to buy it. But the owner of the watercolored pony is a girl Claire's own age and it seems wrong to want something that belongs to someone else. What should Claire do?!