>>42391481
>She's an angel,
All the more reason for Rarity to make sure Coco is properly subjugated. The more pure something is, the more satisfying it is to corrupt and/or ruin it.
>a fruitful business partnership with Rarity in a healthy work environment.
Being in the servitude of the element of generosity, all Coco could hope to achieve will be attained by remembering one simple rule: Serve, obey, and please mistress Rarity and be rewarded; fail or displease her, and punishment will follow.

Just look at Coco's fellow dirtpony stablemate, Octavia. She loves and speaks fondly of mistress, and will train Coco in pleasing her new owner.