Jeanie Bueller (Jennifer Grey)’s Timeline and Summary

Jeanie watches in disbelief as Ferris tricks their parents into believing he's too sick to go to school.
At school, Jeanie is exasperated by a girl who expresses her concern for Ferris, having heard that he's on the verge of death.
Jeanie watches Rooney walk Sloane out of school, where her "dad" is picking her up.
Jeanie's tells off a student who's taken up a "Save Ferris" collection.
Jeanie attempts to see Rooney, but Grace tells her that he's off campus.
Jeanie goes home and confirms her suspicion that Ferris isn't home sick. She hears somebody downstairs and tries to call her mom.
She runs into Rooney, screams, and kicks him in the face, knocking him out.
Jeanie calls the police and then threatens Rooney over the home intercom.
The doorbell rings, and Jeanie answers it, thinking it's the police. It's more "Get Well Soon" deliveries for Ferris, though.
Jeanie gets hauled into the police station, charged with reporting a fake intruder.
She meets a cute junkie who tells her to worry about herself, not her brother.
They make out.
Her mom picks her up.
Jeanie drives them home and almost runs into Ferris, literally, as he tries to beat their parents home. She then tries to beat him to the house.
Jeanie hears that Rooney has busted Ferris at the back door. She saves Ferris and shows Rooney his wallet, effectively busting Rooney himself.