I noticed on other reviews that Adri got a lot of hate from this novella, and while she is definitely mean to Cinder, the author does a good job of fleshing her out so she doesn't just appear as this one-dimensional baddie, whose only purpose in the book is to be a thorn in Cinder's side. You also see that she loves her daughters and husband, is scared of a disruption to the status quo and is terrified that Garan's constant tinkering and inventing is leaving them short of cash. You get a sense of exactly why she hates Cinder so much.
And Iko is in it too! I love Iko! She's so human, but she's stuck in her android body...
"I have a glitch, too. Sometimes I forget that I'm not human."
And check out that artwork, too. Awesome.