We would absolutely be welcoming to speak with her. We may have all found each other through PE, but what bonded many of us is the loss experience. We would be happy to offer any words of support we can.
I also agree with Laura, the blog world may be easy for her to connect with as well. The night I delivered my son (he was too young to make it at 22 weeks), I stayed up all night reading loss blogs - the very first blogs I ever read. It was nice to see that someone else had had similar feelings, that I was grieving normally, and ultimatley some of these stories went on to have happy endings, some went on to never have a child and some were still waiting for the future to unfold. Plus the women I read about have had losses for all sorts of reasons.
I have an idea on how to approach the topic - but if I am overstepping my bounds I am very sorry. Laura (L412Angel) makes beautiful pictures of angel baby names with their meanings. Maybe you could connect with her through her blog website listed and have her make a picture for Rayanne - then you could pass the link on to your sister in law and allow her to proceed if she is comfortable. Just a suggestion.