I want to thank everyone that wrote to help calm me down.
All that work up, and nothing happened. Our daughter got a fever, and with freezing temperatures outside, we decided we had to keep her home, and the Duke did not want me to go by myself. So I ended up not meeting with my sister after all. So now I just hope this is the end for now. I am sad that things have gotten to this point, but the Duke doesn't want me talking to her anymore. And that actually feels great. This isn't my decision. I would decide to keep putting up with the abuse, feeling I had to to keep our relationship going. But the Duke sees that that isn't good for me. I feel such relief that this decision is made for me! I don't need to feel guilty for stepping back either, I'm just obey my husband. It's out of my hands. :)