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<SIA.Dork Diaries: Tales from a Not-So-Dorky Drama Queen is the 9th book in the Dork Diaries series. It was released on June 2, 2015.
Nikki is worried about a rumor that Brandon only kissed her in exchange for free pizza. When she sees Brandon leaving Queasy Cheesy, she is worried that the rumor might be true. Brandon and Nikki get in a fight and they both start to avoid each other.
Meanwhile, MacKenzie is forced to clean the school showers because she hit Nikki in the head with a dodgeball (which knocked her unconscious). When Nikki and MacKenzie are in class, Nikki tries to take a bug out of MacKenzie's hair. When she realizes a bug is in her hair, MacKenzie freaks out and eventually pukes. Someone in the class recorded the incident and started showing everyone at school. Soon everyone sees it.
Eventually, MacKenzie steals Nikki's diary and starts to write in it for a few weeks. MacKenzie shares how she thinks Nikki is the one who put the bug in her hair and filmed it. She also accuses Nikki of purposefully getting her into trouble and sabotaging her birthday party. MacKenzie loses all her popularity and is betrayed by her best friend, Jessica. She found out by the Miss Know-it-all column that said Jessica wanted to ditch MacKenzie.
MacKenzie sabotages Nikki and Brandon's relationship and starts to write harmful insults and/or bad advice in the Miss Know-it-all column to get Nikki expelled. However, Nikki finds out what MacKenzie has been plotting and puts in to an end.
Chloe avoids Nikki and Zoey thinking that Nikki hated people with braces, due to a fake Miss-Know-it-all letter created by MacKenzie. It is revealed that Chloe gets braces. After it is revealed, Nikki, Chloe, and Zoey realize that MacKenzie has made lots of fake Miss-Know-it-all letters, and stops the letters from auto- publishing in the school newspaper before it is too late.
Nikki and Brandon make up and start being friends again. Out of embarrassment from her new classmates who always make fun of her, MacKenzie transfers to North Hampton Hills International Academy. It is hinted at the end of the book that MacKenzie has future plans of getting revenge on Nikki. MacKenzie probably left due to the fact that she was betrayed and embarrassed by all of the CCPs.
- Chloe gets braces.
- MacKenzie transfers to another school.