I’m the Female Lead, Yet I Don’t Fit In With the Main Cast

[Infrastructure and farming + alternate setting + competing for supremacy and becoming emperor + romance, with a low-profile love interest + strong female lead + System] Reborn in the womb, with a System, a master who excels in both medicine and poison, peerless martial arts, and men who admire her wherever she goes: by all appearances, Qi Sigui is a successful Mary Sue transmigrator heroine. But something is wrong! Everything is wrong! Awakening from a soul-deep immersion in a life like a wish-fulfillment drama, she looks at a world that goes against everything she was taught and at the wretched masses at the bottom, trampled underfoot as they struggle to survive. She grits her teeth. She wants to save people. She wants to do something. She wants to end the wars ravaging the land! Warnings 1. Don't apply the novel's values to real life. 2. The setting is entirely fictional, though it draws on references. 3. The heroine is ridiculously overpowered. 4. The early story focuses on farming and infrastructure. 5. The heroine is no saint; at times, she can even be rather cold-blooded. 6. She is a full-fledged Mary Sue. This won't be called out directly, but it will show in the little details. 7. The heroine is very down-to-earth much of the time. 8. The heroine is a commoner with no status under the imperial court. 9. There shouldn't be much scheming. If there's a problem, they just fight. I'll add the rest when I think of it.