This is starting to have some appeal now, though I think you really need to drive the organisation and purpose/plot of the game a little more, it does seem to be rather adrift without much direction ATM: fix the timeframe, fix the military conquests setting (is Rome expanding or collapsing?, is she militarily stagnant and trading?), fix the basis of the intrigues - is this infighting within one family or a rivalry between two houses, and if so for what? controlling voices in the senate? to appoint their general of choice to head up the next campaign?
How close to ancient Rome do you intend to go? It being a patriarchal society, women are effectively reduced to objects or at best powerful schemers behind the scenes influencing the actual decisions of the senators and generals.
My tendency is to play a slighty ahistorical character: a female warrior, a horsewoman, a noble captured in battle in a previous campaign against perhaps the Gauls or Germanic tribes and brought to Rome as spoils of war. She is a slave for some two years but eventually showing her capabilities as both soldier and diplomat is granted her freedom and is now affiliated to a noble house as both a bodyguard and political advisor. By the customs of the day she has been fully adopted into that family.
Her role would be physical bodyguard, political advisor and 'earpiece' to her patron and perhaps concubine also although initially that might not be a significant role. She would be capable of all dutes from bath attendant, through tutor for the children, to conversationalist, to defender to, even perhaps, assassin. Her patron could be male or female
I see her sexuality as ambiguous (though not extending to horses)