It sounds like you are coping really well and she is not. I don't think you can make her understand so the best option is to look at what is real and true and decide if what she is saying holds up. It doesn't sound like it does so then it's a matter of protecting yourself from her opinions. I've had to do this with my 4 siblings and it took me awhile to get there. Eventually it stopped bothering me and I realized I was the authority on my life, not them. It is tough with siblings because there are so many dynamics and they often know too much. Hang in there. It sounds like you are doing well and I'm glad your meds are working. I've been having the sleep problems too so I know that is rough enough!