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Before Season 1
Sabrina has known Chloé since grade school and has done her homework for her ever since. She was in Caline Bustier's class in a previous year with Marinette Dupain-Cheng, Max Kanté, Juleka Couffaine, Chloé, Lê Chiến Kim, and Rose Lavillant.
In "Ladybug & Cat Noir (Origins - Part 1)", Sabrina accompanied Chloé into Miss Bustier's classroom. They walked over to Marinette Dupain-Cheng and kicked her out of her seat, choosing to sit there this year because Adrien Agreste would be sitting in front of them. She was sent to the Library and wasn't seen for the rest of the day due to Stoneheart.
In "Stoneheart (Origins - Part 2)" she joined Chloé when she made fun of Ivan. She placed Chloé's gum on Marinette's seat per Chloé's request. She was present when Stoneheart burst through Miss Bustier's classroom and took Mylène Haprèle and Chloé. She watched Hawk Moth's announcement from the library and cheered as Ladybug made her announcement. The next day she was forced back to her old seat in front of Alix and Mylène.
In "The Bubbler" Chloé ordered her to get a present for Adrien after Chloé forgot his birthday. She was taken to Agreste mansion by Bubbler along with other students but was bubbled after chanting for Ladybug. The gift Chloé ordered her to buy didn't arrive for Adrien's birthday.
In "Timebreaker" she watched the race between Kim and Alix with the rest of her class. She was hit by Timebreaker and disappeared alongside Chloé in both the alternate reality and the new one. She was revived by the Miraculous Ladybug.
"Copycat", Sabrina was seen in the front desks of Mrs. Bustier's classroom.
"Lady Wifi", during the end of Mrs. Bustier's class Sabrina like all the others find that Marinette is still and heads home from school. The next day she walks with Chloe to school and sees Alya sneaking into her best friends locker and followed Chloe and Alya to Principal Damocles office where she reminded him of the rules which resulted in Alya getting suspended for a week. She returns to the classroom and the lesson resumes until Lady Wifi attacks and she runs home.
In "The Evillustrator,"
In "Dark Cupid", Sabrina is alongside Chloé when she asks Adrien to sign a petition against hamster cruelty and the sweater they are forced to wear, even though it is a poster of himself. He signs it, walking away annoyed. Then they, spot Marinette, making rude jokes about why she is searching the trash can. She is seen again with Chloé, only this time showing the poster around to girls, making them burst crying. Later, Ladybug shows up telling Sabrina and Chloé to run away because Dark Cupid is chasing them. Soon afterwards, Dark Cupid finds Sabrina and shoots one of his arrows at her, causing her to hold a grudge against her best friend. After Dark Cupid is defeated by the superheroes, Chloé finds Sabrina scribbling eyebrows, a mustache, and a beard on Adrien's poster, much to both of their surprise.