Ah PE!
Wow...I understand how frustrating that must be!
As you know though, LOGIC and FACTs have NOTHING to do with Jehovah's Witnesses...
The society is making things more emotional, and just using the tactic of "loyalty = obeying everything the GB directs".
Stay strong, but maintain your dignity, poise and grace. By doing that, you will demonstrate more to your sister and show here that you are the balanced, reasonable and happy person. Don't allow her to make you get frustrated, or it will just play into the hands of the "bitter apostate" idea that the GB says we all are.