Love is Magic, in My Little Changeling.

This timid mare got wind of the opportunity of her life, if she managed to snag the position; the Nurse in the Crystal Empire, and at the Crystal Castle of all places in Equestria.

A place and position to die for. It would be heaven, for as long as it may last. She would be the hub of the Imperial Love. Caring for the Princess foal is a breeze.