Today t3 told me that my alters step forward and interact with the world when the adult me doesn't know how to react. That because I switch, I didn't learn how to be ok when triggers things happen, but I just switched and the part that handles that sort of situation did what they always do. She says that as I work with alters, I will release the alter from where she is trapped and the adult me will react to situations in a healthy way.
I guess why I am saying is that maybe your FS does not need to learn to socialize nicely. Instead maybe you can learn to deal with situations in a way that does not require FS and she can take a well deserved break.