No, she's a Swords and Shields fangirl. Specifically, she is a fan of the Knight Captain character.
She is not a fan of Varric, and she is not a fan of being made fun of by him.
Varric: Seriously? Swords and Shields? How did you find that serial? Scrape it off the bottom of a barrel in Dust town?
Cassandra: It was research! I thought I might learn more about the Champion.
Varric: I did write a book about the Champion. You might remember it. Had your knife stuck through it last I saw.
Cassandra: I already read that one. Twice.
Varric: I can't believe you picked the absolute worst of my books to read. Why not Hard in Hightown?
Cassandra: I have enough mysteries and investigations of my own.
Varric: What? You don't want to solve more in your spare time?
Cassandra: Then, you killed my favorite character in Chapter 3, so I threw the book across the room.
Varric: (sigh) A critic. Say no more.
Cassandra: Varric, does Hawke ever autograph books?
Varric: Why? Doesn't your copy of the "Tale of the Champion" have a big hole in it?
Cassandra: Yes... but it could also have Hawke's signature on it.
Cassandra: Why is the second "Hard in Hightown" so completely different from the first?
Varric: (sigh) Because I didn't write it. ****, did you pay actual coin for that book? One of these days, I'm gonna find the duster who wrote that garbage and introduce him to my editor.
Cassandra: By "editor", do you mean your crossbow?
Varric: No my actual editor! Best in the business. She runs half the Coterie in Kirkwall, stickler for grammar. She once killed a man over a semicolon. I'd never print anything without her.
She's a fan of Varric's writing in general