How does the nurse offend Juliet in act 3 and cease to be her ally?

She speaks ill of Romeo because he killed Tybalt, who was her cousin. The nurse also counsels Juliet to commit bigamy with Paris which causes Juliet to lose faith in the nurse.

it is about pretty much the time right after they get married romeo kills Tybalt and he gets banished

Act 3 begins when Tybalt fights Mercutio, Benvolio and Romeo. Tybalt kills Mercutio and Romeo kills Tybalt in revenge so Prince Escalus banishes Romeo from Verona. Then, back at the Capulets, the...

The nurse advises Juliet to commit bigamy and marry Paris when she is already amrried to Romeo.

She tells Juliet to forget Romeo and marry Paris, even though Juliet is already married to Romeo. Juliet doesn't listen an thanks to the Frair that helped her cause the whole tragedy of Tybalt,...