I think, since everyone is in the same group that ethically, it will be okay. I would think of it like friends wanting to help each other if they could; retelling, even experiencing what happened still won't have made it actually have happened to Raegan since it isn't actually happening now to her. Like PTSD, the flashbacks and dreams are not the real thing, they're just proof that yes, something really really horrible happened and one is right to feel the way one feels and react the way one reacts. Raegan will be helping validate Remy!

I bet Raegan will feel proud to be able to help (most youngsters do) and will like the attention and will feel good if you accent that you'll be doing everything you can to keep her safe and comfortable. The others will be "watching" and might get a little "jealous" of how well she does and what attention she gets and be more willing to both help, and share themselves?