1. "Corrupt my children , poison my home? That's not true! It could never , never be true.''

In my opinion, Nora is now thinking of what could possibly happen after the fraud she has done. She is now realizing everything .

2. "It's sweet little bird but gets through a terrible amount of money.'' 

  What i think this is trying to say is you can be sweet or kind but when it gets too money she can spend it on anything really fast without thinking about it.