Hi hun,
What an amazing sister you are to be so concerned and it sounds like you are supporting her in a way that your sister doesn't even realize. My baby was stillborn two years ago and I still grieve for him. My friend was pregnant at the same time as me and it took me ages to be able to even look at her bubs. I'm sure your sister loves your baby very very much but it is so so hard to see babies let alone hold them so soon after suffering a loss. All I can suggest is to continue being there for your sister and hopefully one day in her own time she will open up to you. I found talking about my baby and the loss helped me heaps. It would be fantastic if she could check out BB, I found so much comfort and support here. It really really helps to talk to people who have also had a loss because they know exactly what you are going through. I think you should tell your parents of your concerns, the more support she gets the better she will be. As far as her husband I'm not sure what to say because with me it was different, me and DH actually became closer, he was my biggest support and I am sure your sister's husband is being supportive but grief comes in so many ways that maybe she is pushing her husband aside but I'm sure if she gets help this will resolve itself. Sending you and your sister big .

Regards,
Dianne