Question about Carly Beth and the Horrorlands series.

The Haunted mask is my favorite Goosebumps story. I found out Carly Beth is in the Horrorlands series so I wanted to ask two questions.

  1. Is there any cotiniuty I need to be aware of before I read them all?
  2. It says she is a "special guest". Does this mean she is just a cameo or small role outside of her story, or is she a main character throughout?