I agree with Rhapsody..she feels like its okay right now.. and she is going to hang on to any thread of hope she gets.. even if its false hope driven by her ultimatum to him.

Hang in there. she is likely going to need you again before too long if this guy is that bad. And I must add that her "faith" shouldn't be her reason for staying in an abusive relationship. The bible teaches that a man should love his wife as Christ loves His church.It also teaches that 2 people should not be unequally yolked.. which they seem to be.

Stay strong.. try not to worry.. she wil need you again.. and being the good sister you are i am sure you will be there for her. I know it hurts to be shut out like this.. but she isn't trying to hurt you ...