Isabella Timeline and Summary

1.4: Isabella chills at the convent with Francesca and complains that the order of St. Clare isn't strict enough.
1.4: Isabella finds out that Claudio's been busted for fornicating.
2.2: Isabella visits Angelo and begs the deputy to spare her brother's life.
2.4: Angelo propositions Isabella, who refuses to sleep with Angelo.
3.1: Isabella visits her brother in jail and delivers the bad news.
3.1: Isabella chats with the Duke (who is disguised as a friar) and agrees to participate in a bed trick.
4.1: Isabella meets with Angelo's ex-fiancé and makes plans to punk Angelo.
5.1: Isabella accuses Angelo of being a virgin violator (even though he slept with Mariana and not her) and asks the Duke to punish him.
5.1: Isabella hangs out and watches as Angelo is confronted and then confesses to everything.
5.1: Isabella gets on her knees and pleads for the Duke to spare Angelo's life.
5.1: Isabella finds out that her brother is alive after all.
5.1: Isabella gets engaged (sort of) when the Duke proposes but remains completely silent.