Truly never seen this, niyahow. Most Khaleeji families I know don't do this. The hooyo will not cover her hair in front of her own sons or the sons of her sister and brothers nor boys who haven't hit puberty.
It could be a clan or regional thing. My family is from K5 and border areas. But my parents were born in Mogadishu anyway so who knows. She's been in Canada since the mid 80s herself and has done it ever since.