I am laughing so hard at how bad of an idea it is to sell her into slavery to solve a succession crises. You will just make that succession crises 10x worst and last far longer.
@Halfshadows @obsidianpassion: There is one problem though, we don't really know if it were the sisters who ordered the 3rd one to be sold to slavery just for the succession crises. It was her own guess without proof.