This is posted from the privilege of your house in the west. Somalia is a complete and utter shithole, I have no idea why people here deny that. Wealth is hoarded by an extremely small minority and the average person has no opportunity to climb up the social ladder.
Wahhabism and the rules like the covering up you mention exist because that extreme faith is all most people have.
Young girls are married off to old men because they have wealth. When families would rather go down that route all for money, it says a lot about their predicament. Somali people in Somalia have been failed by politicians. Blaming ignorance for such practices is ignorant in and of itself.
Somalis practised FGM even when the country was stable, during its "golden years" even. This practise is due to ignorance and not instability or poverty. In fact, it costs money to for an FGM practitioner to mutilate your daughters private parts.
Furthermore, asking girls to carry out most of the housework whilst boys do nothing, is again, not due to poverty and instability but sexism and ignorance. The prophet SAW, who was incredibly busy, used to carry out chores inside the house, so where did Somalis get this nonsense from?
No politician goes to people's houses and tells them to do these things.Not all of Somalia's ills can be blamed on "corruption", "war" and "poverty".
In fact, if Somalia ever stabilises fully, you will see the same sexist practises.