Hermione Granger (Emma Watson)’s Timeline and Summary

Hermione reunites with Harry and Ron at the Leaky Cauldron.
At Hogwarts, she appears to be taking more classes than humanly possible, but won't explain how she's doing it.
After being insulted by grown woman Prof. Trelawney, Hermione quits Divination class and doesn't turn back.
Fed up with Malfoy, who's caused Buckbeak to be executed, Hermione punches him in the face. She is on a roll.
After the events at the Shrieking Shack, Dumbledore encourages Hermione to use the Time Turner and fix it.
She puts her thing down, flips it, and reverses it, sending herself and Harry into the past.
She distracts Buckbeak with some dead weasels and howls like a wolf to lure were-Lupin away from, well, herself.
After Harry pushes away the Dementors, he and Hermione fly to Hogwarts tower to save Sirius.
Hermione blows open the cell with a magic spell.
He compliments her, and she feels proud of all the hard work she's done.