Quote: Chicks grow very fond of each other no matter the sexes. But they can grow apart as they age, especially brother and sister. Sisters and even brothers can remain buddies together the rest of their days.
Keep her with whom ever gets along with her, it really doesn't matter who it is. As long as she isn't being harmed or bullied, keeping her with a buddy is good for her mental state. Sometimes we need to make different arrangements for certain birds however and if that means separation from the flock, sometimes it is necessary. Do what is best for her, ultimately.
Keep us posted as the days go by and I do hope she makes a full recovery!