The Jew of Malta Act 3, Scene 3 Summary

Abigail comes upon Ithamore laughing gleefully over the success of his and Barabas's machinations against Lodowick and Mathias.
So, Abigail gets to hear about Lodowick and Mathias's deaths from Ithamore.
This is probably one of the worst ways ever to hear that your dad has plotted to kill your boyfriend.
Abigail, somehow, keeps her cool throughout this exchange, and asks Ithamore to rustle up some of the friars at the nunnery to come talk with her.
After delivering some dirty nun jokes, Ithamore complies and goes to the nunnery.
Abigail, alone, gets to think about what's happened, now having figured out how she worked into Barabas's plot against Lodowick and Mathias.
She gets that Barabas hated Lodowick because he's Ferneze's son, but what did Mathias ever do to him?
Basically, she concludes that everyone is awful.
Ithamore shows up with friar, Jacomo, and Abigail asks him to make her a nun.
Jacomo's confused, because didn't he already make her a nun? And didn't she not like it too much?
Turns out, there's nothing like the death of your boyfriend to turn you around on the whole Christian thing.
Jacomo agrees, but asks her to stop changing her mind on the whole Nun! Wait, Not a Nun! thing.
She's tempted to tell Jacomo that Barabas's various schemes are what's behind her changes in heart, but doesn't.
Big mistake, sister.