The Empress represent rule, legitimacy, tradition, motherhood and strength of character.
Her presence indicates tradition, prosperity, continuity and security while her inversion indicates poverty, conflict and directionless disorder. Inverted, though, her presence indicates novelty and a chance for things to change.
In games, drawing The Empress for inspiration might prompt you to bring in a leadership figure, an older woman or imperial (or similar) forces.
Postmortem Studios 