(((Lilacia))), I'm sorry you're feeling this way.
Still inside and somewhat perceived to be one of them by many, I can tell you that your sister's treatment towards you is the typical JW behavior with anyone, regardless if they're blood or not, that's not inside their click.
After so many hours of meetings a week, plus assemblies, and all other gatherings among them being fed that everybody else is a goner except for them when God's day of destruction comes, they make it a point to detach emotionally from anyone that's not a JW as to not feel anything for them when that day comes.
Just look at them, I mean the ones that really into it, how they deal with anybody else that's not a JW; in a very mechanical, formalistic sort of way. It's so weird!!!
Also, another thing that comes into play is this hyper-sensitive persecution complex that gets in the way or them interacting in a normal way with anybody else.
Awwwwwww, but they claim that they're the most loving, giving people in the world!!!!!!!!!!!!!!!!!
Hey, who knows, now that she'll be a mother, she'll look at the world differently and be forced to interact with other members of society; and then she may come around in a more welcoming way towards you and your family.
I hope you pour all your love, thoughts and energy into those that appreciate it and that in turn give the same back to you.
DY