One thing that hasn’t exactly made sense to me regarding Radiant Hope is this:

Of all the ponies living in the Crystal Empire, why was she the only one that was a unicorn while everyone else was an earth pony?

I mean, you’d think that there’d be more crystal unicorns in the empire besides her, along with crystal pegasi. Am I right?

It’s kind of another reason for why I don’t consider neither Sombra’s “Fiendship is Magic” issue or “Siege of the Crystal Empire” canon, because Radiant Hope being a unicorn while everyone else is an earth pony doesn’t seem logical. And why I’m happy Sombra’s inclusion in “The Beginning of the End” came when it did, of course.

Princess Amore was also a unicorn. And if you don't consider Fiendship and Siege canon, then Sombra was a unicorn too.