My two cents, I totally agree with Michelle. You need to take care of your health. If you dont want her there, dont have her there. Do what is best for you and dont worry about what she thinks. Oh, I am getting angry just thinking about what she said. It's not like you said you need to get a tooth pulled - it's a freakin biopsy for Pete's sake. I know it could be nothing, I am praying that it is, but it is a surgical procedure.
Not something you should just reschedule because her brother is there. What is wrong with this woman? Sorry, I just got a little upset.