Why a woman? You think gender issues are a priority at this point?
He needs to take a lot of things into consideration. In a perfect world, he would only worry about choosing the best candidate even if it's his own cousin. But he has to think about how his pick will be perceived by other clans, whether or not he wants to get into a full-blown political conflict with countries like Ethiopia, Kenya the UAE etc.. When he was a PM, they got rid of him after 8 months because he rushed through too many changes which made these foreign powers and their Somali lackeys too uneasy. I suspect that he will be a bit more pragmatic this time around.
The only way he can go fully rogue is if he has a strong international backer that's willing to bankroll him and give him political cover.