I'm agreeing overall with the sentiments expressed in the last few hours.

I know it's all about the "principle", but at this point, the only thing learned is that she will never pay. I think you are wasting too much energy/effort on this. Yes, in a way, you might feel like, "Well, she'll get away with it." Fine. But I guarantee she'll never do it again to you.

If she had ANY intention of paying you this money, she would have done so by now, and her telling you that she was going to California WAS her way of telling you to NOT expect the money. I'd seriously just cut off all communication at this point and leave it be and spend that energy on your life with your family and leave her out of the picture.

I'm sorry that this happened to you. Specially because it's a sibling, but she's not going to learn a lesson at this point.