Sounds like a pretty traumatic thing for your sister and for you. I suppose everyone deals with loss differently. She might really be okay with it or she might have a bit of a melt down later. Grief also hits everyone differently. At the moment she may just be feeling that she has to get through it and just needs to get on with things.

I think it is okay for your sister to feel however she needs to feel at the moment. It is great that she has you as such a fantastic support. Just keep an eye on her, talk to her about it and let her be however she needs to be. I think that is all you can do.

I would worry about depression and stuff as well, but the only thing you can do is just keep an eye on her and keep communicating with her about what is going on. It might not hit now or ever. It could come a long way down the track like when she plans to have a family or gets pg again or after she gives birth. Just be aware and keep supporting her.

Good luck with everything, I don't think this would be a very easy time for you either. It is great that she has you to support her and trusts you to share everything with you.