I keep coming across semi-invisible (by which, I suppose I mean to HIStory ;-)) women, who quite obviously wield power or change their society behind the scenes of (& often by manipulating) the males whose stories are told, and I can't find a good project to attach them to - in order to give them a trace on Geni.
There are lots of projects for great women, who do impressive things (especially era-specific projects) - but none that encompass women who affect the course of their society by other means as well -
eg by divorcing one king and offering yourself to whoever beats him, causing a battle that wipes out most of the Irish nobility at Clonrarf: Gormflaith ingen Murchada O'Faelain
by quietly manipulating the politics of the colonial government (Nonesi kaFaku, Great House Wife, Twice regent of the abaThembu);
or killing off their powerful son-in-laws or husbands to change the balance of power: Anseflede