Yes! When I first started watching Willow, I was like OMG. THAT'S ELORA and of course, I was really happy that that curly red haired character was Jade and not Elora, but it really is such a coincidence...
Okay, this is a little off the wall but bear with me...
So, it must be a bit of a known thing that Elora Danan has red wavy hair, because otherwise why go to all the trouble of having her dye it?
And what if to keep Elora Danan secret and safe you needed to divert attention elsewhere?
What if you found a little girl, with red curly hair, who was just about the right age, and insisted that she stay by the princess' side, almost like one of your own children? What if you wanted a decoy?
We don't know why Sorsha decided to kidnap a Bone Reaver child, but this one would certainly be convenient...