People who live in denial of their own problems, like your sister's situation, often focus on what they perceive as faults of others to make themselves feel better. Ignore the shade she casts your way and do what feels right for you. When your sister engages you in a negative way, just ignore what she's saying. Remember YOU are the gate keeper to all words (and their meaning) that reach your heart. Keep her words out. Let her rant all she wants. You can let those words bounce off the surface and float off into oblivion where they belong. Only embrace words and sentiments you believe in. Leave the ugliness to the outside world. Your heart deserves better.