Wow, I think you have every right to be upset with your SIL. The announcement was supposed to be a joyous occassion for you & hubby to share with his family and his sister turned it into something all about her.

I think I'd get your hubby to find out if there is an underlying problem that made her so upset, but if there isn't then I think what she did to you was just rude and disrespectful.

You have every right to feel the way you do.

Best Wishes and I hope everything goes well for you.
Sharon