LOL @ Billy the Ex's comment
When I was fading, I was at the baptism of a young bro that I knew well, he was only about 14 when he got baptised. I quietly told his younger sister, "Don't feel pressured to get baptised just because your bro did. Do it because YOU want to do it, not because anyone makes you feel you have to do it." I'm happy to report she didn't get baptised and is living a happy life outside the JWs!
MrFreeze, your sister is a very lucky young lady to have you. Getting baptised at such a young age is going to put IMMENSE pressure on her as she grows during her teens, but at least she has you on her side.