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Before Season 1
Sabrina has known Chloé since grade school and has done her homework for her ever since.
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.