No, she will not. I actually had envisioned her as an RO at first, but I found I just couldn’t write her well. With the possibility of being a friend, a rival, a love interest and/or a sibling, she became too much of a blank slate, and ended up not being much of anything. I really wanted to explore sibling dynamics with her so I abandoned the idea of an RO and focused on that, and then her personality really took shape for me.
I also found that having 4 ROs was the perfect amount for me. Any more would be too difficult to write.
Thanks for asking!