Just wondering, has anyone actually reached out to this women? You say that she was pregnant and then not and that she has not said anything and you and the other mums wonder what happened. Could you ask her if she is okay, offer an ear if she needs it. Sometimes even someone you don't know all that well can be someone you can open up to. She may really be detactched from everything even her own kids and using MG to not have to deal with her kids for a short time. If offering a hand to her helps her open up it can be a bridge to trying to help with her kids too.