The Shelf Talker summary (to be clear about what piece of content is what):
Violet Kupersmith's stories contain clashes between the real world and the spirit world, with a cast of diverse characters, many fantastical.
And then you could say something to close like, that part's definitely true! Thanks, Shelf Talker. Or not.
NOTE: I added a paragraph to the quote you used because I thought it might be nice to use the phrase "fantastic, chilling and ghostly" in the post title and I wanted it to be clear where that came from.
For small text, to add a note, for example, use the "code" formatting option (click on the tiny triangle to the right of "Normal"). In the editing window, it will look pretty bad, like monospace Courier, but from the front, it will be small and in a nice sans serif font.