I could have been her at one point. The truth is, I wasn't coping. I felt like everyone in the world was pregnant but me. I hated my own body, I was resentful that it couldn't do the one thing everyone else's could. I was trapped in my own grief and anger, I was drowning and I couldn't even see how bad I was. I thought if I isolated myself away it would be easier, but it wasn't because no one can run away from their own thoughts. The isolation then made it even harder to deal with the reality of other people's pregnancies when I did have to face it.
Quite honestly, two things helped me in the end. The first was realising that I didn't want other people's babies, I wanted mine. I hadn't faced up to my own grief over what had happened. The second thing was therapy. I suppose if I add a third thing, it would be time.
Unfortunately it is now 10 years on and still no baby, doubt it will ever happen now. But something in me has changed and I have found I am now happy for other people, because that gaping void of desperation in me has gone, acceptance I guess.
People can say she is selfish, or she should do this and that, but the problem here is, you want a relationship with your sister and are looking for a way to keep her in your life, hopefully with her being an aunt to your child. In my experience, whatever anyone thinks, this is something she has to figure out on her own - whether that be finding acceptance in her own way, getting pregnant again or realising she may need some level of professional help, which is nothing to be ashamed of.
I didn't recognise myself in the middle of that black, all consuming rage and pain. I couldn't think rationally and nothing anyone could have said or done would have helped really. What I will say though, is from the groups I have belonged to, many people found it easier when the baby arrived, not all, but it was easier to see it as separate from your own loss. I don't know if this helps at all, but this is the other side of this, there are no easy answers really. All you can do is enjoy your pregnancy and baby and hope she comes around in time.