Hi there. I know - all of us here know - how your sister is feeling at the moment. Anger is a pretty normal response to a cancer diagnosis. Unfortunately, our nearest and dearest are the ones closest to us and unfortunately often the ones that bare the brunt of our anger. I know my wife was on the receiving end at the beginning.
Your sister is just lashing out, and you're an easy target. That doesn't mean it's easy for you to take - quite the opposite in fact.
She'll come around in time. In the meantime, there's lots of resources on this site (see the "living" and "resources" sections at the top of the page) which will help you understand CML which might help you communicate with your sister better I know it was really helpful for me to have family who understood a few things about CML.
Do you mind me asking how long ago she was diagnosed?
David.