Where is there a matriarchy?
Where ever a woman or group of women is telling other women what to do i.e. female leadership.
Example A:
woman wants to pole dance
other women actively humilate her and try to force her and others to follow them i.e. lead them
Leadership does have to be the over-all influence of the entire world; it exists in homes, schools, playing fields, pubs, you name it.
There are many sub-groups of power, each having an effect on each other.
A government leads a country, but the people can pressure the government to change, or even force it out entirely.
Power a dynamic, not static.